Perhaps they should have considered not putting a bright yellow tarp over
the bed of the pickup? Painting the pickup haze gray might have also been
better... Don't know if it would have prevented them from being spotted, but
it surely wouldn't be as noticeable as that bright yellow tarp...

Those Fat Albert RADAR balloons can't see if it is yellow or grey. The DEA
watches anything bigger than a jetski moving up on the Florida coast 24/7