Can't be sure what will work, but I suspect my experience is pretty typical...
About 18 months ago I bought a (new) Forest River Silverback. It is in the lightweight, but fairly upscale category. I like the floor plan and it mostly works well. I expected to fix a few things the first year. The heavy slide (kitchen, TV) had problems - mechanism OK, but brackets holding slide wall to slide mechanism weren't strong enough. Re-enforced that and it's stable. Landing gear failed - replaced 4K lb with 6K lb rated and they now seem stable.
In short, the places where a manufacturer can save money and weight will be the likely failure points. While the original components will work; drive the FW over rough roads for a while and things will fail. The best you can do is compare the specs on the big components and see how close to the margins they are.