UPDATE:
After driving about 2,000 miles on the new puck inserts, I'm really pleased with the results from a handling standpoint. I can't tell if I have changed the wear pattern on the tires. But, I will go to an alignment shop and see if I can set the caster & camber to a medium point with the truck loaded & unloaded.
Having the overload springs now taking a load as a result of inserting the pucks, the truck handles amazingly well with a fully loaded camper, pulling a boat with about 300# of tongue weight & 18" extended hitch. I notice a bit of knocking when I go over curbs & really rough pot holes at slow speeds - just when the camper sways from side to side a good bit. This knocking is of no concern to me.
I'm using about 40 psi in the air bags to keep the height of the rear fender well at the same height as the front fender well +/- 1/2 inch.
At about 500 miles I jacked up the camper to see how much wear was taking place on the pucks. They looked good, no compression, cracking or other noticeable wear.
Bob