I know you have had the tires balanced 100 times, has any of them been on a “ROAD FORCE” balancer?? This is a special tire balancer that actually puts a roller against the tire to simulate the road. These are much better and finding bent rims, and poor tires then the older spin units. Also if you have a steering stabilizer on this truck (if you look under the front end it looks like a sideways mounted shock absorber). I would replace it with a new unit, maybe a higher performance unit. Dealing with Jeeps I have seen this cure a lot of issues.