6 x 12 Conversion, Rookie Questions

I've been lurking for a few weeks and decided today to take the plunge and do a conversion of my 6 x 12.
I already owned the trailer. We closed our thrift store and we kept it. It's been sitting around waiting for something to happen to it. It's a 2004 Express 6 x 12, with ramp rear door, single side door, a 3500 lb rated axle, and total (as manufactured) weight of 1380lbs. No brakes keeps the GVWR at 2990 lbs. Looks like I have 1600 lb to play with, but I'll try and keep it less than that.
Conversion Plans include shower and toilet in one room at the front, television, AC, twin width bunks for 2 in an L arrangement across the back and along "driver's side" side. A fridge, but no galley. Storage cabinets to fill in the empty space (Yeah, I know. What empty space?).
Usage is mostly urban, suburban. I'd use it on a 2 or 3 day road trips staying in parking lots or rest stops instead of motels, and maybe 3 or 4 day day trips to the FL Keys again staying in parking lots and such as to avoid motels. Probably not much boondocking or camping or KOAs.
If you smart guys will indulge me a bit I'd like your feedback on a few things. Please feel free to argue for or against them. You won't hurt my feeling by disagreeing with me. As far as this new adventure is concerned, I have no ego. I'm too ignorant at this point to have one. Here are my thoughts:
1.As much as I prefer simplicity in design, it seems like some things should be 12v DC regardless of whatever other electrical systems may be in place. I'm thinking interior lighting and water pumps. Pumps and light fixtures seem to be plentiful in 12v models. Do you agree or disagree that even with generator or shore power, 12v water pumps and lighting is the way to go?
2. I'm thinking one room for toilet and shower with a large floor pan, say 36 x 24, shower surround, and a toilet similar in design to a house toilet (To satisfy my wife. She thinks porta-potty / airplane / boat toilets are gross) that would sit one one end of the pan, and all of the attendant water tanks. How do you waterproof the inside of the shower door? What about ventilation in the shower room? General thoughts?
3. Since I'm not a campground camper and more of a city camper do I save money by not worrying about the 30 amp plugs and wiring? I can see myself plugging into 120v AC outlets attached to people's houses and businesses where I'm staying (with permission of course). So instead of there being a 30 amp plug on the outside of my trailer I might have a couple of 120v AC duplex outlets on the outside. Seems like the wiring on the inside would be the same regardless of the type of plug or receptacle on the outside of the trailer, wouldn't it? And what if I did want the ability to get power from a KOA 30 amp tonight and plug into my brother in law's outside receptacle tomorrow night? Is that a wiring nightmare? Oh, yeah. I'll be using a generator for power most of the time when there is no other source. I suspect I'd need a couple of 12v batteries in parallel to power those lights and water pumps I mentioned above. Is this an electrical nightmare or is this everyday wiring?
Thanks for getting this far along in my post. I'd love to hear your thoughts. Feel free to give it to me straight.
Dave
I already owned the trailer. We closed our thrift store and we kept it. It's been sitting around waiting for something to happen to it. It's a 2004 Express 6 x 12, with ramp rear door, single side door, a 3500 lb rated axle, and total (as manufactured) weight of 1380lbs. No brakes keeps the GVWR at 2990 lbs. Looks like I have 1600 lb to play with, but I'll try and keep it less than that.
Conversion Plans include shower and toilet in one room at the front, television, AC, twin width bunks for 2 in an L arrangement across the back and along "driver's side" side. A fridge, but no galley. Storage cabinets to fill in the empty space (Yeah, I know. What empty space?).
Usage is mostly urban, suburban. I'd use it on a 2 or 3 day road trips staying in parking lots or rest stops instead of motels, and maybe 3 or 4 day day trips to the FL Keys again staying in parking lots and such as to avoid motels. Probably not much boondocking or camping or KOAs.
If you smart guys will indulge me a bit I'd like your feedback on a few things. Please feel free to argue for or against them. You won't hurt my feeling by disagreeing with me. As far as this new adventure is concerned, I have no ego. I'm too ignorant at this point to have one. Here are my thoughts:
1.As much as I prefer simplicity in design, it seems like some things should be 12v DC regardless of whatever other electrical systems may be in place. I'm thinking interior lighting and water pumps. Pumps and light fixtures seem to be plentiful in 12v models. Do you agree or disagree that even with generator or shore power, 12v water pumps and lighting is the way to go?
2. I'm thinking one room for toilet and shower with a large floor pan, say 36 x 24, shower surround, and a toilet similar in design to a house toilet (To satisfy my wife. She thinks porta-potty / airplane / boat toilets are gross) that would sit one one end of the pan, and all of the attendant water tanks. How do you waterproof the inside of the shower door? What about ventilation in the shower room? General thoughts?
3. Since I'm not a campground camper and more of a city camper do I save money by not worrying about the 30 amp plugs and wiring? I can see myself plugging into 120v AC outlets attached to people's houses and businesses where I'm staying (with permission of course). So instead of there being a 30 amp plug on the outside of my trailer I might have a couple of 120v AC duplex outlets on the outside. Seems like the wiring on the inside would be the same regardless of the type of plug or receptacle on the outside of the trailer, wouldn't it? And what if I did want the ability to get power from a KOA 30 amp tonight and plug into my brother in law's outside receptacle tomorrow night? Is that a wiring nightmare? Oh, yeah. I'll be using a generator for power most of the time when there is no other source. I suspect I'd need a couple of 12v batteries in parallel to power those lights and water pumps I mentioned above. Is this an electrical nightmare or is this everyday wiring?
Thanks for getting this far along in my post. I'd love to hear your thoughts. Feel free to give it to me straight.
Dave