I have an 04 f150 screw (5.4. 3.73 gcwr 15k gvwr 7k)which will be towing a kz frontier 2809(29feet, 7000gvwr but weigh only 6200 loAded).Anyone towing with the standard stock tires bf goodrich rugged trail p275/65 18(max payload 2600 35 psi)?oR DO i need to change to LT(light truck) tires to accomodate the extra load.Take in mind that this is the truck i will use for daily commute and probably will use the trailer approx 6x/year.