This probably doesn't apply very much to truck campers but it's interesting nonetheless.
Steve Lehto is a lawyer in Michigan who specializes in consumer protection and "lemon laws". He also runs a very popular YouTube channel. He's just done one titled FIGHT THE URGE TO BUY AN RV.
The basics of his argument is that if you buy a ten thousand dollar econo-car, it's covered by a lemon law in all fifty states. If you buy a quarter of a million dollar luxury motor home, it's not covered by any lemon law anywhere. He's got a lot of other interesting things to say as well. Worth watching.
(BTW, many of his other videos are also very interesting. Things like "When can the police search your vehicle on the side of the road", and "Passenger rights in a car pulled over by the police".)