First of all, don't rush in your search. Many manufactures make things look good on the inside, but the quality underneath is sloppy or poor. Look under sinks, in the storage area as to how plumbing and wiring is routed. If you ever have a problem, you will have to access these areas. If you find a unit you like, and it is built well, it would be worth spending a bit more than paying for headaches down the road. There are many RV companies that have frames built for them by a 3rd party. Companies that do this may or may not have their frame built to their specs. Be sure you get a strong frame. Check into companies, although few that might build their units from the ground up. Be sure the insulation R factors are good. If a company won't give you certain specs, then they are hiding something.