I'm picking up my kit next month and I am planning on using a 6x12 u-haul trailer. I know I need to raise Todd frame to make it clear the rails. I plan on use if two four by fours with stop blocks on either side of the frame rails and strap the frame down. If any one knows of a better way of getting it to fit let me know. My only question at the moment is what is the frame rail width from center to center.