We took some measurements to begin the design process. We selected locations on the axle and on the underside of the bed, and measured from these marks. The upper shock mounts wouldn't be attached to the bed, but we wanted to tuck the upper mounts as high as possible. We also wanted to keep the shocks at a reasonable angle. Sure, it's possible to mount long shocks at severe angles, but severe angles make the shocks' valving ineffectual. We began by measuring our reference points at ride height.