[f5fstop]

Find another dealer, that is not normal. As for the dealer's statment, do you believe a dealer who won't repair your vehicle? If a dealers cannot find the problem, they love to say it happens on all H3s. Then you go to a forum and find out it is not normal. Odds are the dealer is full of s**t.
Personally, with your miles and my guess at when you purchased the vehicle, I would go after the rear diff.
If you had the cylinder head problem, you should set a code for misfire. However, if your rear axle is going, it will give the same symptoms, especially the unbalanced tire feel. Early, prior to August of last year, some of the rear axles were produced with lapping compound left on the gears, and this destroyed the gear set.
If you have a legitimate problem, three trips to the dealer is as good as three attempts to repair the problem in most states.
I go back to my first statement...find another dealer.