simple simple smiple fix......get a ruber bungey cord, remove one of the hooks, attach one end to the rear bumper brackit, or hanger brackets for the exhaust.
Let the ruber strip drag on the ground, this will ground your truck as you drive.....I'm sure autoparts stores will sell a grounding strip, or something better than a Bungy coard, I get zapped all the time, helps my dispostion and gives me a boast to my day.....the maetal eatel endut ou

 

They sure spell "funny" up there in Canada !!!