I have a 2000 2500 cummins longbox with 305/70 16's. I've only had the truck about 3,500 miles now and I have replace both the vacuum pump twice and power steering pump three tmes under warrenty from Oriellys. Is this a commin problem with the oversize tires or am I just getting bad parts? I still don't have enough assist to turn the front wheels when idleing and not moving. Any comments or suggestions would be greatly appreciated.