We always taught 1/2 the posted exit speed maximum.
Some of the older guys used to brag that they could push it just enough to see one outside tandem start to lift.
Being on the east coast, the smoothest guys would be POed if they didn't time the surge and drop down a weight class when getting onto the PA turnpike.
They tried to roll onto the scale [yup PA entrance booths have a scale] as the product surged back making the drives light and get a class 7 ticket instead of class 8.
For years we had 20 foot containers for Merck on 25 ft chassis that had the neck extended three more feet BUT Merck wanted the containers a the rear of the chassis. At the time PA used a portable strip around 6" tall weighing one axle at a time. Raising either tandem 6" made the product flow back making the drives light the forward making the trailer tandem light. Got away with that for years though NJ would grab us on their scale after the water gap.
Platform scales are supposed to be level and I would instruct trainees [usually experienced but not liquid] to stop on the scale and leave the brakes off!
We would walk in to get the ticket and they would be looking back watching the truck roll back and forth 6 - 8 inches; just waitin to run back and pop the brakes before it rolled away. Never did; that's how you weigh the load and not the motion.