My current RV was a rental before I bought it... One advantage - the amount of money they make on rentals directly ties to how little down time it has - so I found many of the issues seen by others here were already taken care of...
The dealer renting units knows the weaknesses - and to make the most $$ has to be proactive addressing them.
We still had some issues certainly - but 2 years and 15K miles is a 'young' RV - and hopefully 'debugged' already.
Taking the time to go over everything - and taking them up on their 'camp nearby' offer are both very good ideas.
gmc is right. They do maintain them very well and most have a pretty thorough "every time it rents" inspection process it goes through to make sure the previous renter didn't break anything and also to make sure everything works good for the next customer.
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie