Are there any SRW with more that a rear axle rating of 7,000 lbs? When I towed a large 16K fifth wheel, I picked one with a 2435 dry pin weight. Which I verified when the manufacturer. Loaded for snowbirding/full timing for two years. My rear axle scaled weight was 6750 with a 7,000 RGAWR. Truck was a 2015 RAM 3500 4x4 Laramie with the heavier Aisin tranny. No generator or W/D in the trailer.
I see many SRW trucks towing large trailers that I know have put the trailer over the truck rear axle/tire ratings.
My combined weight was 24,500 lbs.
