Staples and glue. If you want to see how well made an rv is hire a few 6 year old's to run around inside for 30 minutes. Let them use the bed as a trampoline and see how the frame holds up. An experienced 6 year old can rip a flat screen off a wall and burn out slide and awning motors within the allotted time.
I was not impressed by Thor products while looking on the lots. Just with people going through them and opening doors and drawers, I saw things start to fall apart before the rv hit the road. Screws and Hinges ripped out and molding ripped off walls was the obvious. These are things that are going to fail once you own it too.
Look underneath cabinets to see how they are assembled. Assemblers tend to waste a lot of screws by missing their mark by NOT hitting any support. Usually when you screw a screw into AIR it does not bite, making it kind of useless. But, they keep doing it !
I also found some Thor units plumbed the bathroom sink into the black tank. That would not work for us because we boondock most all of the time.
No matter what brand , try to find a dealer that will work with you after the sale of any rv. Don't rely on a salesman knowing the answer, ask the mechanics, that's how learned about the black tank plumbing and slideout problems.
No matter what brand you buy:
If you buy one on-line at a discount don't expect a dealer to jump for joy when you go there for service. You can forget about a dealer doing anything for you after the warranty.
On the other hand:
If you buy from a trusted dealer that you know and you pay more for the rv, you offer that dealer some cash in his bank to help you because you have awarded him financial wiggle room and some will do that for you after the warranty hoping you'll come back as a return customer. Some smaller dealers have been known to dig into their own pocket for you after the warranty or during the warranty when the MFG refuses to take action.