Flex Air Pin Box vs. Mor/ryde Pin Box

[Cummins12V98]

Originally Posted by paz

OK, that explains it. I couldn't tell from the photo that the bottom plate slides or that the round projections on the bottom had zerks. At first, I thought the projections were socket head cap screws just holding the bottom plate in place. Thanks for the explanation.

By the way, I have a Trail Air pin box. The bottom plate on mine does not slide, which was another source of my confusion..

You can replace the lower jaw with the TriGlide portion. It will lower the kingpin plate and in turn raise the front of the RV. Then the hitch should be lowered or raise the kingpin where it's bolted to the frame.

[wingnut60]

Mark Bruss,
Can you elaborate more on your statement: " but many of the heavier trailers (like DRV) are near the limits for the pin box."

[Dale & Mark Bruss]

You will find the pin box rated for 20K or 21K and that is about what the GVR of a DRV.

[wingnut60]

Thanks, never gave much thought to this area of towing.

[jacknife]

The higher end version is will cant and move like a moryde will also go up and down . Google up the website and you will see 3 different models.