Right now, it really seems that despite some cheap parts here and there, the worst problem is the basic assembly of the units. Flimsy "this and thats" can be tolerated if they're properly installed and secured. The plumbing is strong enough for anything the average Joe can throw at it IF it's installed properly. The dreaded rubber roof will be fine for most users for length of its 10 or more year warranty IF it's installed and sealed the way it should be. Water leaks, which are probably the ultimate bane for most of these boxy RVs, are almost always due to lousy construction/assembly.
I was waiting for the next economic downturn to buy an RV, expecting the work force to lean out the riffraff. But, in retrospect, it seems like the last down turn is when the weak frames and construction practices (no real supports under the holding tanks for instance) became common.
If we keep buying them, I guess we're telling the manufacturers it's OK.
Hmmm