I think your actual pin will be north of 4K and I agree w/ fj12 about disregarding the UVW and what is the max GVW instead.
Perhaps to give you a comparison: We had a '15 F350 SB, CC, 4x4, 6.7 and thought that would be our last truck thinking it's a 1 ton w/ some hefty ratings. Spring of '17 we upgraded RV to one in sig. Advertised pin was 2,888 and dry weight of 13,420, max GVW of 16,000. Weighed it as soon as we got it and it netted: Pin 2860, dry was 14,000.I'm just a whisker under 11500 on the truck and 22500 on the combo....again empty.
Fully loaded for week vaykay (nobody in truck) netted: Pin of 3740, combo: 24470, truck rear axle: 7360 (capacity (7000), total weight on truck: 12350. So you can see, I'm over on everything. Ran it all of 2017 w/ no problems. 2018, we decide to make FL our summer trip and now the overage is really starting to nag at me....especially the trucks tires (3460 each capacity). Taking into account of already being over on things, heat generated as things are, higher air and road temps, we ended up getting a dually. Didn't want to, but will say, it made for a much more comforting trip. Wife even said she liked how it towed compared to old SRW truck.
Another thing to consider is stopping ability w/ a SRW and 5er. Had a cousin who bought a Montana front LR when they 1st came out in early 2000's, Had a SRW GM and said stopping things was a challenge. They bought a med duty GM which took care of that.
I don't know the ratings of Fords SRW alum body trucks, but IMO, I think you would be better off w/ a dually for this coach. My $.02
2017 F350 DRW XLT, CC, 4x4, 6.7
2018 Big Country 3560 SS
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