Welcome, I'm Chris (aka Moose). All experts are independent contractors here at Just Answer none are employees, we do not get a paycheck or benefits from JA. We work for the customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.
Put 500lbs in the bed against the tailgate and retest. If that helps or makes it worse then its a driveline angle issue. Drive a stretch of road and make it occur its worst and note exactly what you notice. Then rotate the tires and do it again. If it changes at all then its a tire balance, tire belt, or bent rim concern. If none of these effect it then a vibration machine that analyzes vibrations to help pinpoint them is needed to see if its the engine, trans, or driveshaft to blame.
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