Double drop question.

I'm sure that solid rod is connected at one end or both by a rubber grommet that can be popped off by a screwdriver. If not, then make it so.

 

I had a clevis pin with a hairpin holding it in. Could pull the pin out in a second. Had the valve with the big handle on my trailer. One of my customers was local heavy haul for Amtrak. They don't screw around.

 

You can put a bypass line on the tractor air ride and someone make a electric override.

Shims will raise the ride height . my new trailer is built to run with 4" clearance, but driver needs to know what he is doing.