If I was strappin down to that trailer I'd have 4 straps. 2 in the rear around the axle or maybe hooked to the carrier and then out to the eyes. Two on the front either around the upper or lower ballpoints, depending on strap length the. Down to the eyes. It'll never move like that. And then my anal self would bring the extra from one of the straps through a footpeg, over the seat, and tied off to the other footpeg. Cause riding the frame when your seat blew off goin down the road sucks ass.