Steering wheel angle while towing

I would make the adjustments to the washers and head, and then get out on level ground and see where you are at. Not worth making guess adjustments from uneven ground, IMHO. The ball should be 1-2" higher than the coupler prior to hookup, on level ground with a level trailer loaded for camping. The truck will drop more in the grass the the camper will on concrete.

I am using a 1" rise ball in mine, I needed just a hair more height but not a full hole. I'll try to find the part number, but right now my email search doesn't show the order.