You are talking about what is called full-timing. There are number of folks here that do that, and will likely chime in.
Pending that, you are not talking brand as much as you are talking models within brands. A full-timer's trailer is going to be the higher end of a manufacturer's line for any given length. You will want to have durable furnishings and fittings. The lightness and cheapness of a vacation trailer's stuff will go to pieces under continuous living. You will need more storage than a vacation unit also.
You seem to be in the market for a trailer and a tow vehicle simultaneously. I would recommend settling on the trailer you want first and then on the tow vehicle to pull that weight of trailer. Use the Trailer Life tow rating tables (see www.trailerlife.com
and go to the Tech section). If you plan to use the trailer east of the Mississippi, reduce the tow rating by 10% to give you a bit of safety factor. If you plan to tow in the mountain west, including the Pacific Coast make that reduction 15-20%. Do note that tow ratings are a matter of engine, transmission, and, especially brakes. You are not just choosing a stiff suspension, you are choosing a balanced and safe package.