Replacing the Lippert 1621HD with a Trailair Flex Air 5th Wheel Pin Box  

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.

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…

According to Lippert, their Trailair Air Ride Replacement Pin Box, part #LC158778 would use the same bolt holes and would occupy the same footprint as your existing 1621 pin box. If your old unit provided 6 inches of clearance, so will the…

Even though you weren't able to find a sticker or label on your pin box to determine the make and model number, I have a solution to be able to determine which pin box is on your 2011 Dutchman Voltage 3900. Selecting the style pin box and then…

The Flex Air 5th Wheel, #LC328492 is to be inflated to between 20 and 120 psi. The pressure that works best for your specific arrangement and the current load is what determines the best pressure. Trying several different pressure setting and…

You can use 8k springs on a trailer that has 7k axles. You'd just have a little more spring capacity than needed. If the dimensions of your springs are the same as the part #DX74XR springs then you would not need new hangers. Worth mentioning is…

They really are very similar and interchangeable but the #MR84VR is for replacing a Lippert 1621 pin box whereas the part #MR94VR is for replacing a Trailair setup that also was for the 1621SHD.

The correct MORryde Cushioned 5th Wheel Pin Box for a Forest River Vengeance Rogue 5th Wheel Toy Hauler 311A13 is part #MR84VR which offers a direct bolt-on fit. It has about the same dimensions as the pin box it replaces so you don't have to…

The correct MORryde Cushioned 5th Wheel Pin Box for a Grand Design Reflections 337RLS is part #MR84VR. This pin box will do a wonderful job of helping smooth the ride due to the internal cushioning which reduces road shock.

The difference between a Lippert 1621 and 1621HD pin box is the heavier-gauge steel material used to construct it. Dimensionally they are the same. Short bed trucks do have tougher time making sharp turns with a 5th wheel trailer due to the reduced…

The Trailair Flex Air 5th Wheel Pin Box - Lippert 1621 - 18,000 lbs, #LC328492, is compatible with all 5th Wheel Hitches but not any Gooseneck hitch adapters. It will work with the PullRite hitch you mentioned. All you need is the correct capture…

Because the head of PullRite hitches pivot you will always need to use some sort of capture plate or wedge kit to prevent the king pin from pivoting inside the jaws of the hitch. Without one you'd go to turn and the hitch head would turn but the…