I would advise staying away from the short sidewall tires, not enough load capacity to carry the weight of the truck, especially 215/65s on the front. I would suggest no smaller than a 215/75/15 on the front, perhaps a 255/70 on the rear.
Other things you need to keep in mind besides the load capaicy, which should at least equal the weight of the vehicle plus load, witha safety margin, is tire diameter. The smaller the diameter of the tire, the higher the RPM wil have to be in order to run a given speed. It's basically the same as running a lower ratio in the differential. If you're still running the stock diff, that would be a 4.11.
