Van Compass has developed a custom tuned Fox shock kit to improve the Promaster’s handling both on and off the trail. Our custom tuned Fox shocks smooth out the harshness experienced on washboard roads and sharp, abrupt impacts. The bounce experienced over large bumps is reduced and the side to side sway over uneven surfaces is minimized. Each set of Fox shocks are specifically tuned per application. We like you to have your van weighed for shock tuning if extensive modifications have been made. Please allow 2-5 days for us to tune shocks after your order is placed and we get the info we need from you for shock tuning.