7x14 Snow Mobile Trailer

Converting Cargo Trailers into TTTs

9k heat pump enough?

Postby wanabxtrm » Fri May 22, 2015 11:01 pm

So I've pretty much given up on the portable ac unit. I think if I were anywhere further north it would have worked out, but not here. I'm looking at either a 13.5k heat pump or a 9k right now simply because they can be powered by my honda generator. I'm leaning toward larger because if I ever get the 'wings' sorted out that will be a big source of heat exchange inside to outside.

So the question is, is a 9k BTU heat pump sufficient to cool down a 7x14?
Thanks,

PS- installed a new vent, and got the fantastic fan mounted on the side. I'll throw a picture up later this weekend,
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Re: 7x14 Snow Mobile Trailer

Postby khigh » Sat May 23, 2015 9:23 pm

9K is more than enough for the insulated square footage.

The popouts are going to be your wild card. Not sure how to calculate for those.
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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Sun Jun 28, 2015 2:07 pm

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don't thinks I ever posted a pic of the vents... Flip up for driving, and the fantastic vent for normal venting and cooking. I returned the portable AC unit, should have listened to the forum reviews on the things, wasn't worth a quarter what I paid for it. Upside was I got a full refund on it! Ordered a 9k mini split AC, plan on mounting the external unit on the front if my measurements are right it should just fit without hitting at full wheel lock in a turn. If my measurements are wrong I'll be getting a rooftop unit. Finally getting some progress and a sense of order in our household. (Recently had our 3rd child in April) and stuff is starting to fall into place. Our new truck seams to handle the trailer well, though the rear suspension is pretty soft and sites littler low without the load eq bars in place. In other news I got the bed loft up. Used unistrut and it came together quick and easy, though is heavier than I hoped/intended. I'll be looking into pulleys and or spring assist for it next. Bought some roof paint but haven't had the chance to put it on.

That's about it

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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Sun Jun 28, 2015 2:12 pm

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PS-pic of the new truck to drag this thing around with.
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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Mon Jul 06, 2015 7:07 pm

Painted the roof with a gallon of the Henry's solar reflective paint. Worth the price of a gallon from HD. Previously the trailer would alway be hotter than ambient temps, anywhere from 1-2 degrees to 15+ F based on the the thermometers I have in it (one inside in the V next to the electrical panel and one hanging a few inches under the floor directly under the same spot) and where it was parked sun/shade etc. After applying the paint it has consistently been either the same temp or slightly cooler than outside. PS- my roof was bare aluminum prior, half of which is insulated at this point.

Re: loft bed; I think I've decided to use some gas struts to offset the weight of the bed and frame. I figure between the frame, plywood, mattress, etc its close to 150-200 #'s so I'm going to go with 4 struts either 1 in each corner, or stacked end to end in the center to increase the stroke. Anyone use any routinely that has an opinion on that??

Minisplit looks like it'll fit ok, but I still need to do a final check that it won't hit anything when the trailer jackknifes. I had hoped to have it mounted by the end of the weekend, that didn't happen.
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Re: 7x14 Snow Mobile Trailer

Postby ty98zr » Thu Jul 30, 2015 8:19 am

I am curious to see how you are coming on your build. Have you gotten the ramp door rooms built yet. I am looking at doing that as well and just looking for ideas.
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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Fri Jul 31, 2015 9:54 pm

I haven't built them yet but have played around with ideas. I think I'll be using 3/4 u-channel aluminum struts with 3/4 foam board in the center. Think big frame around the foam. That's basically how my side door is made and it's solild. The foam will act as the walls and roof covered in glued on canvas. The test pieces I've made are solid and rigid and the canvas when painted looks good, and acts as a decent fire brake before the foam. I considered skinning in aluminum but that's pricy. The foam is cheap and light and should do the trick. Walls will be hinged to each other to fold together and roof overlaps. Everything is pinned together using cotter pins through the frame (u-channel). I'll post a pic of one of my test pieces later tonight.
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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Sun Aug 02, 2015 2:07 pm

Finally made some decent headway while the family was out of town. Electrical (AC) conduit installed along with more insulation, and some cheap cabinets placed for layout measurements/confirmation. It looks like everything should line up well. The conduit and loft framing marry up with the insulation depths and work out to be hidden perfectly; so I should have a nice clean wall in most spots. Cabinets and shower pan placement should work out as well. That is if I get as far as putting in permanent water facilities. I'll be starting with big blue jugs and a water pump for the near term with just a sink that drains to another jug.
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Couldn't find the test piece for the ramps must be buried in the garage I'll try dig it out sometime this week.
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Re: 7x14 Snow Mobile Trailer

Postby ty98zr » Wed Aug 05, 2015 3:08 pm

you are going with a more rigid wall design than what i was thinking. I thought maybe you would go with a canvas fabric type design for your ramp rooms. I have a trailer just like yours minus the front ramp door that I am currently converting and wanting to utilize the ramp as well for that extra space.
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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Sun Aug 09, 2015 8:50 am

I've considered canvas pop top style too. And may end up with that but I'm hoping to be more 4 season friendly. Either way I won't tackle that until after the main space is mostly done. There are a few places that make replacement tops for pop ups I figured it'd be easy enough to buy one of those and make it work.

Saw this today also, that style design has promise too, only two hinges and then the hoops. http://www.countryliving.com/life/a177/ ... _214821251
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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Sat Oct 17, 2015 8:21 pm

So it's been about a year since I started this project and finally camped in it for the first time. Worked out well, and found a few issues I'll need to address. As far as useful updates for other builders go:
Bed: used 4 50 lb gas struts that have an 18" length of throw to extend it. I had used the thin electrical uninstructed vice the 1.5" standard size which caused binding when one end was higher than the other. I think if I had used the full sized struts with their trolley wheels I wouldn't have had and issue. I solved this by 'floating' the bed off the frame and only have it physically connected by the struts, but resting on movable brackets attached to the uni strut.
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note this pick was pre-final solution and it would bind where the angle iron nuts attached to the wall.
After sleeping I think I may need to move from a vertical gas strut design to a angled setup to give me more room, I felt like 3 more inches would make all the difference. *update*Decided to go out and see if I could make it happen and shock surprise my subconscious strategically placed my original cross brace to allow the struts to line up perfectly on an angle. Old...
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; new...
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bed
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You can see the bracket got moved to the inside of the vertical 'rails' which allows them to float, but prevents fore/aft movement by rubbing on the sides of the rails. I'll slide the 2nd attached bracket up to the bottom side of the bed in the desired position to secure in place. I haven't used the bed enough with the struts at an angle to confirm that it won't cause a secondary problem, but I doubt it will. It does however give me close to the 3' of total throw of the struts, which is significantly more than I'll need in the end, and solves any concerns from my first camping outing. It does however prevent a perfectly 'clean' wall in that spot, and eliminates one layer of insulation, but I think that will be an ok tradeoff in the end.

AC: as previously noted I went with a 9k minisplit. I have the interior side mounted and had the exterior in place but pulled it to reinforce the brackets. Even without it fully operational I'd recommend going this route over the rooftop if you have space on the nose to fit it in your design.

Weight. I weighed it and tip the scales at ~3600 lbs wih tools and most things in it. I figure after I'm done with the remaining items I'll end up around 3800-4k. I had hoped to be less than 3.5, but elected on thicker insulation, and heavier materials for the bed, cabinet etc. Towing with the sequoia yielded 10 mpg over 1000 miles. My older diesel jeep had averaged ~18 mpg fully loaded with it. Factory the trailer weighed just shy of 2k for reference.

I've bought the counter, and sink which were the final layout obstacles (coupled with the shower) and now have the end in sight, albeit far off. Once I get the counter in and it cleaned up I'll try to upload a few photos. Which should hopefully be this week if all goes well. I'm using ikea butcher block for the counter and their dual bowl sink with drainer mounted as an inset. I'll cover up the drying drain and 2nd large bowl with the cutout from th butcher block to maximize counter space.

I had planned on using an old piece of 6" pipe as a grey water tank turns it since it's well casing not dwv pipe is doesn't marry up easily with box store fittings, so I reconsidered buying an actual grey tank. After much internal angst I've elected to make the pipe work, just at a smaller volume than originally intended (~1.5 gal/lf). I had planned a u shape with 2 90 bends, but after adding up the costs I'll be sticking with a single straight pipe which should yield about 7 gals of storage, equivelant to 1 'cube' of my freshwater portable tanks. Should still work out for most needs.

Anyway thanks all for the inspiration, even if it's sucked unintended time and money (I was oringally thinking a hammock sleeping bag and camp chair!) it will no doubt be worth it.
Last edited by wanabxtrm on Sat Oct 17, 2015 10:26 pm, edited 1 time in total.
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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Sat Oct 17, 2015 10:23 pm

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PS- a shot of us boys on our first trip in the trailer.

gulf coast swamps...
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hard to see in the low res photo, but theres a gator or two down there....
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Re: 7x14 Snow Mobile Trailer

Postby wanabxtrm » Sat Oct 24, 2015 10:07 am

Not mounted yet but cut and fitted still need plumbing and faucet.

Kitchen....
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Workbench...
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Got the exterior minisplit unit mounted and wiring roughed in. Hopefully I'll get the freon lines run next weekend and fire it off for the first time. Grey water tank and lines got laid out underneath. and all should work out for both the sink and shower. No pics of that yet though.
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Re: 7x14 Snow Mobile Trailer

Postby Rainier70 » Sat Oct 24, 2015 8:30 pm

I like the looks of your butcher-block top. It's coming along quickly.
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Re: 7x14 Snow Mobile Trailer

Postby EvenOlder » Thu Dec 03, 2015 2:42 pm

I would surely appreciate any pics and/or notes about your mini-split AC system.
I'm looking to do the same (Sarasota FL camping!) in a 7x16

Thanks-
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