TrailAir Kingpin question

So they say the arrow should be the mid range of movement?!?

Never heard that, but makes sense now that I think about it.

guess I've been putting too much air in mine too, but never over 100 psi when hooked up... with 2590 pin wgt I always thought more is betta :)

will have to adjust after a bit of riding and watching the rear view mirror on bumps and dips next time...

thanks for the insight gentlemen ! for those that stated psi they use, @ what pin weight are you running that pressure ?

OP - on you're earlier question - my bottom plate is parallel with the ground... and the top plate points 'up' at almost a 30 degree angle (it came that way from the mfg )

Here is a cut and paste of the response from Ultra Fab.


I think you are fine it does look like it is sloping down a little (the top
fixed part of the pin box). This is installed into the frame so you can't
really install it wrong because the bolts will not line up.
You should only air up the air bag when you have weight of the trailer on
the pin box. You don't have to remove the air when you unhook. The arrow on
the shock is a starting point and should be the mid range of motion of the
lower jaw. You can increase the air pressure up to 100psi if needed but let
the ride determine the amount of pressure you ultimately have.

The angle on the kingpin seems to be normal with these hitches. I was concerned when I put mine on too. The only thing it effects is when you are hooking up as it makes it a little more difficult. I have to come into it high and then let it down a little as the pin gets into the hitch. I hope you like the hitch. I like the way it takes out the up and down jarring out of the ride but I get a lot more back and forth jarring than I did with my Demco Glide-Ride. I tried to get the Tri-glide model when I ordered it but they said it wasn't available for my model of hitch? Thought I could add the lower plate later but now I find that they want $1200 dollars for it! Not worth it!

Leave the pressure where it is. Hook up RV and take it to level ground. Now let the air out slowly so the top cover aligns with the top of the arrow. Now take it out and see how it rides. Air up or down as needed for best ride. A small difference in height on the arrow adds up to quite a bit of bed space to her.

Thanks for the advice. I was hooked up when I aired up, and it took 90 PSI to see the top of the arrows.

I guess I will air down and try again.

You don't have to line up the arrow point when inflated. It depends on the tongue weight. Mine is lined up to the bottom of the arrowhead. I adjust it after I'm hitched. The PSI will go up considerably when hitched so your 90 PSI may go up to 130-140?? PSI. I run just over 50 PSI when hitched but it will vary according to how I am loaded.

B.O.

Air up after it's attached to the truck. I run mine at about 41PSI to get it at the arrows. Also note that if there is tension between the truck and trailer while hooked it will effect this. Make sure that tension is neutral on the first air up, tow it a bit and adjust from there if need be based on load to ensure you are traveling with it adjusted to the lines.

Love ours,,, enjoy! :B

You need to air up while hooked to the truck and then only to the point of the arrow....

At 90 psi it may as well be solid rubber

Photo looking straight on.