They are generally built for the rental market so actually they are sturdier than most but also lacking in amenities. They have no cutout in the overhead bunk so you can't walk from the cab to the house without banging your head. Most are lacking awnings and have linoleum instead of carpeting inside. They also seem to lounge for sale much longer in the used market as opposed to other brands, even at a lower price. All that said, if none of that bothers you, buy one and go camping!
I am NOT a mechanic although I do play one in my garage!