Gordon,
We have run these trails with my father in his 4Runner. You could easily do most of them in your fancy off roader which is a much nicer version of the 4Runner. I would want to be cautious around creek crossings to make sure that the water wasn't too deep, given the computer driven systems in that machine, but it should not be a problem at the end of July first of August.
Generally not an issue with scratches as the trees do not crowd the trail at the lower elevations and do not exist at the higher elevations. Other than Black Bear and Poughkeepsie, dents and dings should not be a big concern unless you drive like you stole it.
I like the new picture of the bus with the Tetons.
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