Fleetwood's been around a long time, and look at where they are.....
I'd have to see one up close to make a determination one way or the other, but they are on the 'heavy' side for being considered "Ever-Lite"... Which, to me, seems like a good thing.. Means that it's not built on the 'cheap' and might actually have some structure to it...
I have a 2003 Fleetwood and it's been fine as far as holding up over the last 7 + years.... I was just at an RV show this weekend and most of the new trailers from all manufactures seem to have better 'fit and finish' attributes about them compared to mine.. I looked at a new line of LANCE travel trailers, which is new for them, as they have been a slide in camper manufacture for a long time and they were very nice... Just a bit high on the $$ side, but looked like a nice rig...
I'd pour over them by looking at the frame and how it's welded and how the cabinets and appliances are installed and open the cabinet doors and look at the mechanicals and look at how the plumbing and wiring is all laid out.. If it looks sloppy and fit and finish is not good, then that's an indication of the company as a whole.....
Good luck!
Mitch