[bobbecky]

On the 2012 Cougar RES 327, I would go with good LT truck tires, as they will be way under loaded for that rig. For the 2015 3402 Montana, go with either the S637 Sailuns or the Goodyear G614, or there are a few other G range tires available that will work. On both rigs, get rid of the E range ST tires, and you will have a much safer rig, and will likely never have a tire failure that will do major damage. We went through 5 of the Marathons, never had a blowout, caught them all before total failure, then decided to get the Goodyear G614. Get to see much more scenery, because I'm not constantly watching the mirrors for tire debris flying from the rig.