Curious, I checked my policy and although I found nothing about overloading, payload or otherwise, I did find that my company can deny a liability claim for "misuse," which includes things like use during a commission of a crime, reckless driving, racing, etc., including "use of a vehicle in an unprescribed manner." I don't have to watch 300 episodes of Perry Mason or Lehto's Law to know that is a pretty broad clause.
Now in New York a truck owner can register their pickup as a personal vehicle, or as a commercial vehicle. Mine is registered as a personal vehicle and maybe that makes a difference.
Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, factory dual exhaust, 18” wheels. Build Date: 3 June 2018. Now at 96544 miles.