Use a chock on the trailer and back into it, then put in drive just to take the truck weight off, press hard on the emergency brake and then put in park. Bingo, its lose.
No man has a good enough memory to be a successful liar. Abraham Lincoln
2016 36FBTS Pinnacle
2016 F350, 6.7, 4x4, DRW, long bed
B & W Companion 5th wheel Hitch