smaller tire, heavier car, but when the Satellite was on 255/60 radials I found my sweet spot at 17.5 lbs. For your combo, I'd start at 16 and work up until the 60 drops off.

Congrats on getting out. I haven't been here at Moparts much recently, but is this the first time out for the Rampage? If so, Congrats! Have fun, Mike!!