We were warned about the original 6 ply tires that came on our 14-DB being a liability.(Single axle) I replaced them at Discount Tire with 10 ply Good Year tires which I run 60 psi in. Since my lug nuts were rounded off they replaced them with Ford lugs which they had in stock for around $42. They are longer lugs and take care of the rounding off problem. I also put 10 ply Michilans on my Taco at the same time and run 60 psi in them also.They made the ride a lot more stable.