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Be sure it's a box van. Moving vans have the lowest ground clearance
If the road is clear ahead of the van, likely he'll have the cruise on.
Steering corrections per 100 miles travel is cited by big truck mfrs as FE significant. Keeping perfectly lane centered is the game. On a straight piece of Interstate I can pretty well let go of my wheel for the better part of a measured mile (my one ton Dodge or my Kenworth); really, just holding it against crown with two fingers.
If you can't, it should be top of the list to correct. Getting out of wind is a good way to isolate.
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