Between the Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs Item # LC369535 and the Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs Item # LC158778 there is no difference in their bounce and chucking reduction. The only difference they have is there is a slight dimensional difference between the exterior bushing width measurements. LC158778 is 14-13/16" and LC369535 is 16-1/4".
Both Pin boxes eliminate bounce and shock from the road with their internal... view full answer...
You are correct that they are the same thing. The Roadmaster Comfort Ride Shock Absorbers for Tandem Axle Trailers # RM-2460 combined with the Roadmaster Comfort Ride Add-On Kit # RM-2460-50 will have the same parts as the Roadmaster Comfort Ride Shock Absorbers for Triple Axle Trailers # RM-2460-3. So there is no difference aside from that fact that one is for tandem axles with the add-on kit to upgrade for triple axles and the other comes with everything in one kit for a triple axle trailer. view full answer...