As mentioned the clubs or RV sites are a good source of info.
Heres a experience I had last year. My wife and I wanted to start camping again. We bought a Jayco hardside pop-up (looks like an Aliner) at the Knoxville show last Feb. The camper was put together nicely and the fit and finish was good.
One big problem.....the camper had a heat pump / AC unit in it made by Dometic. That's where the problem started. The unit condensated bad and the water accumulated in the rear storage box where the unit was located.
Four times back and forth to the dealer and the issue couldn't be resolved.
They made us a good trade in offer on a KZ travel trailer and we bought it. Very happy with the new camper. They had 2 of same models we bought so I got to pick the one I liked best. And yes there were slight differences on the fit and finish. Same company, same model.
Now back to the Jayco. IMO the camper was fine,the heat pump / AC unit was a poorly engineered design.
So how do judge quality? Does a bad piece of equipment make the quality of the camper bad?