Try WD40 we had a nest in the tongue of our boat trailer and it took care of it within 24 hrs
what about a car wash. one that has undercarriage washing ability. the other idea is jiffy lube or any oil change place where they can walk under the car maybe they could spray it for you.
You can buy a can of wasp spray (RAID brand??) that allows you to stand 15 feet away from the wasp nest....works great! (Not sure if it would damage the paint on your truck however)
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