They all have some problems. Some brands seem to have fewer. I don't buy into the find the best dealer cause you'll need them scenario. They need you. Especially when the warranty's up. I read 5+ brand forums. You can see a trend of which brands have the most issues and what type of issues they're having.
Many times it's not a MFG fault. Like a water pump failing. What you want to look for is things like a slide leaking, roof membrane has staples popping up under it, screws on the slide out seals breaking, cabinets failing, furnace ducting insufficient in some rooms, etc. Few brands can escape most of those issues.
There's also the owner that's a nit picker. I have yet to walk in any RV that didn't have something sloppy somewhere. I will say that Airstream seems to be pretty clean as well as Lance. I disregard reviews from owners complaining about things like the steps are too high going into my 5th wheel's bedroom. While that is a design flaw it's not a warranty problem.
Most all MFG's use the same suppliers for parts. It's how the parts are assembled thats important.
Quite frankly I'm not sure I want to take my chances on a new one. My 5 year old 5er has been rock solid reliable.
