I agree with with the posts above. For that RV you need a one ton dully.
I've towed with one ton longbed SRW F-350s. It towed a 34' 15,000lbs. GVW Teton fine.
Also towed a 39' 16,500lbs GVW towhauler. I never overloaded the truck but in a strong side wind I did have to keep it to 55 mpg cause the tail would wag the dog.
Pin weight on my MS loaded is right at 4100lbs. GVW is also right at 18,250lbs. My 2017 F-350 dully handles it great.
IF you do go for a SRW make sure it's a longbed one ton, but that's not what I would recommend.
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Mike & Trish Romans 10:9
2011 Mobile Suites 36RSSB3 #5556
2017 F-350 CC 6.7 diesel dually, Banks Derringer tuner with super gauge
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