Towing 6000 lbs boat behind gas class A

[TLLOYD]

I am at an RV show now and the wife likes the 2016 Thor Miramar 34.2. I am questioning the salesman in the towing capacity as I have a 4500 lb boat on an approximate 1200 pound double axle trailer.
He is of course stating the rig will pull it as the hitch sticker says it's an 8000 pound rating (which it does say).
I told him I think it only has a 5000 pound capacity or even less as I was told that the gas class A rigs are around 5000.
The brochure I am reading says GVWR is 22000 lbs and GCWR is 26000 lbs.
He says I will be fine pulling it just a few times a year to/from the river, but I am skeptical for safety and the drive train.
Any suggestions as the wife is adamant she wants this RV. We do drive the boat and leave it at the river and drive it home when we are done.
Thanks

[KD4UPL]

I'm quite certain the salesman doesn't know. You'll need to look things up for yourself. Do you know the empty weight of the RV. If you subtract the empty weight from the GCWR that would give you what's left for cargo AND trailer.
I suspect it's not rated high enough to handle the boat.

[Colo_Native]

Gas are only 5000# salesmen will tell you anything to sell it.