Steve St. Laurent said:That would do it. Without airing down I'm surprised you got very far at all. Trust me - if you air down (WAY down like I said above) it'll be nearly like driving down the road. You will get stuck on the entrance road to the sand dunes here in Michigan if you don't air down. Air down and you can drive up all but the steepest dunes there.
I can contest to that, just got back from Pismo Beach in Ca. 16PSI all the way around. Trailer at half of what you came in with 30PSI.