100 out of 100 truss deliveries I've seen are just as the OP describes. Trailer pulls up and they slide them off the back and onto the ground.
Then the rest of the wood shows up and then the metal. (Or flipped order of delivery)
I've never seen any of the deliveries in the back of an...
I posted the wrong pic last time. I edited it.
It looks like your linkage in the third pic is flipped 180°.
It appears it should be pointing to the front.
The road and bridge tax on my vehicle registration was doubled ~10 years ago. If I were sleeping in a vehicle and crossed the state line driving into my state, I'd be jolted awake.
When you checked the wiring back to the computer, did you also check for any shorts to ground?
Other than a frayed wire, I think you'd be looking at a bad injector driver in the computer.