Unlike Goodyear the G614 which is overkill for your rig, the Marathon is junk. Go to Discount Tire and get a set of the Maxxis RV tires. These are Asian tires but are very well built. Maxxis is known for their high quality off road tires. I am running them and would do it again. By the way, last time I checked, the Marathon is an import as well.