For "full timing" you need to give some more information.
Budget, size, number of occupants, would all help.
For some generalities, most manufacturers of Travel Trailers do not warranty new units for "full time" living, so your first couple of months you will likely void the warranty unless you specifically select a model that allows for it.
Appliances, frames, axles, are basically similar across all the manufacturers, again with some limited exceptions. So no matter if you are looking at entry level or some mid to high end units, the warranties and quality of those components will likely be similar.
Walls, cabinetry, roof, and furnishings do vary by model, and vary between lines. And basically you can see the changes in price, tin vs Filon, particle board vs wood etc. Most manufacturers build similar model across more than one price point.
Go visit a few dealerships, look at construction materials in some entry level units as well as some higher end models, look at furnishings, built in is usually cheaper than a stand alone unit in things like sofas etc.
Also consider what you feel comfortable in trying to repair and maintain yourself.
Your in the first stage of a longer road.
