How do you skip-shift 10 speed tractor trailor?

It's a stupid thing to do - all it accomplishes is to bog down the motor and reduce component service life, thus leading to higher maintenance costs. And if I found a driver of mine were doing it, I'd fire them on the spot.

If you really need to know, you tach the motor up to around 2000 RPMs before you upshift. Then you lose anything you gain by skip shifting because it takes a longer time for the motor to wind back up after being bogged down that way. Skip shifting on the upshift is utterly pointless. One of the reasons many companies rev limit their motors to 1500 - 1700 RPMs is to prevent their drivers from doing this.

On downshifting, it's a different matter. Rather than dropping down to the vicinity of 1000 RPMs before you downshift, you drop it to 700 - 800, instead. Then you can drop two gears in one downshift.