Speaking of towables, you won't find a top quality made RV for a cheap price so don't even go there.
How many TV screens or sound system means nothing. Start with a crawl underneath to see who made the frame. Pay special attwention to how the spring hangers are reinforced. Look in the basement areas to see how the wiring is laid out. Bundled? Protected from chafe? Large guage from battery bank? Same with plumbing. Neatly arranged? Things like the pump easily accessible?
Inside look for fit & finish. Moldings fit neatly? Decent drawer guides? Solid entry steps or thin guage wobbly steps?
Details. It is all about the details. Details take extra labour to be right.