As far as Noises go, they are all to thin, you can hear your neighbor if in a campground where they pack you in like sardines.
UL's are narrower and shorter which equals less storage and insulation. Also are more arrow dynamic, which again cuts into livable space.
If I remember right, you want to use this unit for more than a weekend camping unit. If so, I don't recommend a UL. If your going to use it in colder months, dont get a UL, if your going to use it in hot months, dont go with a UL.
Go to your next trailer show, check out all the floor plans and storage of each, compare true 4 season units to UL.
Please don't think I am against utralights, I am not, I want a small tent trailer to tow behind my jeep wrangler and go where I can not take the big 5th. But our 5th, we dont consider it a trailer, its our mobile condo! We keep it packed with everything to go at a moments notice.
I guess, you need to decide how you intend to use an RV, get a floor plan that fits your needs, and enjoy.
'01 F350 PSD 4X4 CC LB SRW, firestone air bags, bilstien shocks, superchips 60hp, 4" cat back exhaust, front end leveling kit, aux trans cooler
'00 315 wanderer, Honda EU2000