Hi Judy,
Yes, we have heard of them. One of our members is a part-time RV hauler for them I believe.
The standard bumper to hitch warranty from the factory is 1 year to the original purchaser. It is not warranted for commercial or residential (read full-time) use.
For this dealer to offer a 7 year warranty is a big thing in my opinion. My guess is that years 2-7 are for service at his dealership only as it could cost him a small fortune per coach in warranty reimbursements over the long haul.
Worth checking into though as I understand he has great deals.
Best of luck to you and welcome to the forum. If others on the forum know about this dealer, they will chime in.
Jim