I tell ya, comparing the capabilities of a Ram 3500 SRW with a Ford F-350 SRW, Ram nails it with a much higher payload and a 12,300 GVWR available. I could tow our Bighorn easily with the Ram 3500 SRW put the comparable 2017 Ford SRW just isn't, well, comparable. Ram seems to have done their homework on that count. Too bad there's not enough headroom for me in their higher trim models.
Looks like a 2017 F350 CC 4X4 SRW with the HD towing package using a fifth wheel hitch can tow either 13.6K or 18K (short vs. long bed). Weight is limited on the long bed by the hitch rating or it would be 20K.
https://www.ford.com/resources/ford/general/pdf/towingguides/17RV&TT_Ford_SuperDtyPU_r2_Sep29.pdf