by KCStudly » Wed Aug 07, 2013 3:16 pm
The thing with those manufactured trailers with side rails is that most all of the ones I have seen are made from angle iron. The side rail is an integral part of the structural strength of the frame; a ladder style side frame, and angle iron is not a very rigid shape when unsupported.
Cutting the top rail out means that that strength must be gained back some how for the bottom rail to survive. This is not an issue if you securely attach the cabin to the trailer floor in several locations along each side. The depth (height) of the cabin has great rigidity and by connecting the two together as one you would have plenty of strength reinforcing the lower rail. Just strapping cabin down at the 4 corners won't do; the trailer could still flex out from underneath.
The extra connections would make it much more difficult to remove the cabin from the trailer, and would leave the trailer weak if you do.
In my opinion, you will never have a traditional looking camper with the side rails, and you will have a weak utility trailer w/o them. Sure, you "could" do it by just cutting out a section and making it so that you can securely bolt it back in, but it will need to take both compression and tensile loads, so plan on squaring it off and having it attach at the top and bottom with a couple of bolts each front and rear. I would steer clear of a gate; I don't see how an operable latch could reliably transmit the loads (the "doorway" of the gate would act like a hinge point allowing the frame to flex).
There have been a couple of examples of trick setups where rigging cradles or jacking feet were used to attach to the sides of the box and lift it off of the trailer relatively easily, but you have to consider electrical connections, anchoring methods, and how all of these extra features are going to impact the appearance of the camper.
The WAZAT is another good example, but it is only 4x8, and is aluminum, so two people can handle it.
I'm guesstimating that 98/ct of home builders that I have seen ask this question (including myself) come to the conclusion that it is just not worth the hassle and they have quickly abandoned the idea. $0.02
One last thing, in the Foamie section, GPW helped Eaglesdare come up with a nifty little arrangement for a rear entry standy (or was it a slouchy?) that was built out over the railings of this type of trailer. If I was contemplating building a removable cabin for this type of trailer I would be looking in that direction.
KC
My Build:
The Poet Creek Express Hybrid Foamie
Poet Creek Or Bust
Engineering the TLAR way - "That Looks About Right"
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