looks so good! these will definately be my next set of tires (once i get my ome installed)...good to hear it doesn't put much more strain on the 3.7, was my only concern about stepping up to 33's from my 32's...
When you've finally decided on a tire that you LIKE...ie good traction, self-cleansing abilities, good even wear, not too loud)... And you KNOW the tire fits, it's no longer about the size of the tire - you switch your concerns to the stress the larger tire will add, if any. So, I tend to care about the weight of the tire, load range/ply, sidewall ply... - things that contribute to the weight, haha.
In the end you want to make a decision that best suits your wheeling. I wheel in a mix of everything, mud (though I hate it), sand, rocks, snow (when I can find it)... and depending on where you are wheeling rocks on the East Coast aren't QUITE as bad as West Coast - this would normally effect your sidewall ply requirement. But, anyway, these are things that will, or should, ultimately affect your tire decision.
I just kind of got lucky. There are several 3.7L's running around with 33's. We just have to be a little smarter about our tire choices than the V8's, but it is possible. And then there are other options for improving power, which I plan on doing, lol.