I think we are talking about reasonable leverage.
The first thing to understand is that you don't have lemon law protection for the living area of the unit. If you buy a motorhome the chassis and engine are covered by local lemon laws.
The second thing to understand is that once you have signed, taken delivery, and driven off, you are now pretty much dependent on the dealership. Dealers span the range of great to horrid.
Now, dealerships represent they do a PDI. If they are a great dealerships they will do a great, though limited PDI. Often done in an hour or so based on a 3 page list. If they are a horrid dealership, they may just sign it off without doing much of anything. You just won't know. but they are hoping you take them at their word. But you do know that after you sign off your reasonable leverage is gone.
Owners of RVs just wanna have fun. Salesman just wanna close the deal and get rid of you...well some are a bit better than that, but they ain't your friend. Yeah, the salesman is thinking what a pain in the Axx this savvy owner is and my unit sold check still ain't in the mail.
So, the more astute buyers just slow down the process and insist on doing more...one of the more is their own slow, detailed, extensive PDI. And not signing off until "everything" is fixed, whether a new or used unit.
Once upon a time, in a land far, far away, there was a buyer of a used high quality dp they paid around $200,000. And of course they were in love with the coach and had dreamy eyes and were itching to leave on their break in trip. So much in a hurry, and knowing that the dealer was a great dealership, that they decided to sign off and leave on good faith. So, none of the fluid samples were taken, which if they had been would have told them there was a serious engine failure headed their way. Now, of course the dealership did a great PDI, but fluid samples weren't on the PDI list.
The engine blew, within the first week, sorry don't remember the details, and the cost was around $30,000. The dealership covered $10,000. Remember they bought as is, no warranty and no lemon law for the used unit. Well, let us say that for something less that $600 and one week or so of time to take the samples and patiently await the results, it cost them $20,000.