Would the Ultra-Fab Trail Air Pin Box part # LC158778 Replace a 1621HD Pin Box  

Because it's lighter, less expensive, has fewer moving parts and is mechanically less complicated I'd recommend going with the Gen-Y #325-GH-8040 shock absorbing pin box versus a Trailair Flex Air like part #LC328492. The Trailair features a…

Even though both the Trailair Air Ride #LC158778 and the Trailair Flex Air #LC369535 look similar and incorporate the air bag and shock to help improve your towing experience, the Flex Air has a few upgrades that the Air Ride does not have. The 2…

The difference between the 1621 and the 1621SHD is weight capacity and how many bolts is required to mount it. The 1621 uses 4 bolts for mounting. The 1621SHD requires all 6 bolts to be used.

Since your 2019 Grand Design Momentum 351M has a Lippert 1621 pin box the Trailair Pin Box part #LC158778 will fit and give you a much smoother ride! I attached a test course video link for this pin box to this page for you to check out that shows…

If you are looking for an improvement in ride quality over the Roto Flex you have installed on your trailer currently the best solution is the Flex Air as it cushions vertically and horizontally and the Trailair is just vertically. So for that…

Since your 2019 Grand Design Momentum 395M pin box has a 1621 bolt pattern and 21,000lbs GVWR I recommend the Trailair Air Ride 5th Wheel Pin Box #LC158778. This Air ride pin box replaces the standard pin box on your 5th-wheel trailer to cushion your…

SnapPads like the SnapPad XTRA Jack Pads for Lippert Leveling Systems w/ 9" Round Jack Feet - Qty 6 Item #SP54FR6 can be taken off and on as needed so you won't have to keep replacing them every time you need to take them off.

Great question, Jeff! When the Rota-Flex first came out it renovated what a pin box could do and be, but at this point in time that technology is a little more dated and the Gen-Y Hitch Shock Absorbing 5th Wheel Pin Box #325-GH-8040 is the "new…