Full time TT living in a four season trailer in mid-atlantic

Take a look at the Nash products, sadly they are a West coast company now but if you can find one locally I'd take the time to look at it. Most polar packages on mass produced trailers don't do much except add a layer of coroplast underbelly and a layer of foil insulation. A four season has enclosed tanks, valves, and plumbing. The water hookup is typically in a door enclosure to allow radiant heat from trailer. Most mass produced units have external hookups and waste plumbing/valves.