I am ordering bilstein 5100's for the rear of my f250. It has a 9" lift and is used just for street driving and towing a 21ft. ski boat in the summer. What valving should I run in the rear the H5 has 255/70, T7 has 270/50, and the T5 has 298/36. It would be nice if the T5 was the way to go since they are about $30 cheaper each at 4wheelparts. I just have no idea what those numbers mean can anyone help me out?