Interested if anyone is towing with a Yukon/Tahoe. I have an 8" drop receiver coupling which puts the top of the ball right at 19" with a couple of hundred lbs. on the back bumper. Wondering if I need to go longer on the drop for a 560 SUV since the recommended range is 15-19". I spend a fair amount of time on NFS roads, which sometimes are not in the best of shape, and don't want to drag the tail end of the trailer going over and down some of the hills and dales that those roads typically include.