It is a 6.1 Hemi. I don't have any, and while I could take one as it is in the garage, it is really dirty from all the trails.
I had 40s, but the new KM3s only come in 39, so that is what is on there now. It has a EVO desert racing suspension with King shocks, and an Atlas transfer case.
I have towed it behind my Motor Home. It mostly stays in Moab at our house, but we did flat tow it to Ouray, CO this past summer. Black Bear is fun with how wide it is. I used to have 12" wide wheels on it, but went down to the 9" Raceline ones to get the width down a little.