Hit a 13'6 ¹/² bridge.

Westbound built in the 50s is thirteen six, Eastbound is a foot higher.

 

On a properly functioning system, I doubt the height loaded V unloaded will be much more than maybe 8MM or so. If something breaks, all bets are off.

 

It is, the Westbound is lower than the Eastbound. It's the Westbound that has the special overheight sensors and HEAVY fines for ignoring. The Eastbound was built in the 70s and is a foot higher.

 

INNOVATION NEVER RESTS

This is an air ride trailer suspension, as opposed to an air over spring truck suspension.

 

One thing about Norfolk, if you think you might trigger the overheight on that bridge-tunnel you have 2 options. You can go over to the other bridge-tunnel that comes out in Newport News, or go all the way over to the James River bridge.

 

It can be more than few inches, if you do open deck and the crane lifts the load off , those air bags stretch out a lot. .

 

The dump valve works, I have never had 1 blow.

 

I'm still trying to grasp how this applies to the situation. His trailer is supposed to be 13'6" empty. For whatever reason, you believe that it's going to get lower when loaded. For the sake of the argument, let's assume that you're correct, and the trailer drops to 13'4" or whatever. Now when he gets unloaded, why is it normal for that trailer to be 13'8"? Springs are going to bring it back to 13'6". Air, when properly functioning, is going to bring it back to 13'6". His equipment failed. It has little to do with being loaded vs empty.

At the very least, do a little research into the subject before making snarky comments. They might have taught it wrong at your school, or you may have understood it wrong. I also not only do my pre and post trip inspections, I am typically the one who troubleshoots and fixes them.