I recently went through the same dilemma you're having right now, but driving a land yacht is well worth the benefit of pulling my mobile condominium down the road.
Purchased a 2015 Landmark Savannah and desperately wanted to stay in a SRW setup, but the numbers don't support the wish. What I found was I kept busting the truck's GVWR long before the GCWR was an issue. As built trailer coming in at much higher dry weight and pin weight than the brochure didn't help the cause. Even with my 2014 Ram 3500 DRW, I've only got 1,700lb. of cargo weight to work with once vehicle weight, passengers, pin weight, and hitch weight are subtracted from max GVWR of 14,000lbs. Max GCWR is 32,000 and even with the truck and trailer fully loaded (hypothetically at max GVWR for trailer), I'm weighing in at 26,840. Only bring it up to highlight truck GVWR is an issue well before GCWR is and it's the same equation regardless of manufacturer.