I towed a 2005 Keystone Raptor 36DS12 with a 2005 Ford F-250 4x4 CC SRW SB Diesel over 25,000 miles with zero issues. One of our fellow campers towed a 40" WW with a 2006 Dodge 2500 CC SRW LB Diesel just fine. I stuggle with weight issues as when I picked up my Raptor (special order because the DW wasn't happy with interior colors on the lot) my GVWR for the trailer was stamped 12,500 and the one next to it (with the green interior) was stamped 15,500. Also seems odd as the axles were each stamped 7,000 lbs. for a total of 21,000:h