Old thread, but ......
Ours is on the 5ers frontdrop down frame rail and stuck there with some 3m commercial hook and loop tape which is several times stronger then the Velcro HD brand. Many miles, never moved.
Dave W along with my DW, Susan and our poodlepups, Callie & Molly,2011
Ford F250 6.7 CCLB, 5er Hitch Option w/B&W Hitch,,Ride Rite air bags, 2014
Montana High Country 343RL (38')w/disc brakes