Well here is what I have found out on cost for the Endurance.
Local tire shop here quoted me 177 a tire mounted and installed. But. I can order them from tire rack at 133 and free shipping and Hibdon will charge me 15 to mount and balance and 7 to break down and take old tires off.
I will probably go Tire Rack and Hibdons as it is cheaper,
Four tires that come off will become spares.
Perfect world and lots of free cash I would upgrade to 16's and LT. That is the best choice. Looking at the total cost of that now with recommendation of earlier poster local to me.