The 6.2 is the replacement for the v-10 and is supose to have compatible numbers with the plus being better mpg. I had the v-10 pulling a 13k 5er. Had it been 3k lighter and a trailer I believe it would have done fine. My major issue is I am old school and did not like the engine running at 4k to get the power band.
Summary you should be good, I would just address possible trailer sway for its size.
2015 F350 Lariat Diesel Dually, White, Hitch Kit.
2013 Dutchman Voltage 3200 Epic II 5th wheel.