Hector, If you have a fixed base, a good air supply (1/2 inch hose and at least 60 gallon tank) it will be cheaper to buy an impact wrench and a whole lot easier to use. Dale is on the money with his suggestions.

However, if you do not have a fixed base and you contemplate changing your own tires on the road also, then the X-12 is the real deal with the size wrenches listed.

If you can wait until Sevierville, I have one for you to look at and play with before you make a decision. Do not rule out a large wrench with a 4' extension for practicality. Our torque values are around 500 so that is another option. There are other things I would buy now before I would buy the X-12.