Tiny houses.

Some are considered RVs now as they have the same RVIA stamp. I have talked to one dealer/builder and they warranty them to be able to travel the highways just as well as an RV. Some are built on TT and some are built on GN or 5ver trailers. Custom built, home type cabinets not the junk RV type, same or better quality appliances as RV. I've been looking at them as a possible toy hauler...not sure why people think they are flimsy, built with 2x4 structure, some have horizontal wood inside and out. They use rigid board insulation or spray foam insulation. DRV uses the same basic stick construction but they use metal studs and rock wool insulation so why are they not considered flimsy also?? The RV manufacturers that I went through the factories on only use about a couple dozen #10 or 12 screws to hold the sidewalls to the base whereas these people use 3/4" bolts to hold walls to frame so where's the flimsy in that?? Just courious, been looking at them, pricing them, not any more expensive than an RV but built like you want it built with options you want. Not saying they are the answer but they might be worth looking into.