Cars have shocks; your trailer should too. Roadmaster Comfort Ride Shock Absorbers help float your trailer over the toughest roads. Independent tests show Comfort Ride shock absorbers and slipper spring systems reduce energy transmission to trailers and fifth wheels by more than 80% over a variety of surfaces. Comfort Ride heavy-duty, nitrogen-charged shock absorbers eliminate trailer bouncing and porpoising. They're also angled to provide sway control. Vertically Mounted Shocks â Patented, adjustable mounting brackets eliminate the space constraints and also allow the shocks to be mounted vertically, where they have the leverage to limit up-and-down motion on both compression and rebound. Angled to Provide Sway Control â Because the shocks are angled 15° to the outside, the trailer's weight stays centered over the tires, which helps control sway by limiting lateral suspension travel and side-to-side rocking. This kit is designed to cover a 2-axle (tandem) trailer with 2-3/8" diameter axles. Includes 4 shock absorbers and hardware. Vertically mounted to limit up-and-down motion on both compression & rebound Angled 15° to the outside to center the trailer's weight over the tires Four shock absorbers to cover a 2-axle (tandem) trailer with 2-3/8"" diameter axles | Roadmaster Comfort Ride Shock Absorbers Tandem Axle Kit for 2-3/8" Axles