I've thought an inflatable aero treatment made the most sense.
Make it so it's foolproof and easy, that lazy slobs will still be compliant.
Make it with relief valves so lazy forgetful slobs don't break things when they back into a loading bay without deactivating the system.
Maybe make it out of the type of rubber used in high end rafts (PVC?). Tolerates higher pressure and abrasion resistant.
Perhaps it could be made so that when the pump is reversed, the thing sucks back into a minimal storage compartment out of the way.
*Not implying all or even most truckers are lazy slobs
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