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http://www.tooled-up.com/MicroCategory.asp?MAN=Cordless-Impact-Wrenches&CID=34&SCID=447&MCID=1849

Try this. There are lots of different impact wrenches out there, Snap On is a popular one too but the Sealy 19.2v is a good one for the price, Snap On is around £300. They can take off a wheel nut with ease and a charged battery will last a whole day in a car workshop.

12 volt impact wrenches that are powered from a cigarette lighter socket are widely available, eg. http://www.machinemart.co.uk/shop/product/details/cir13c-1-2in-impact-wrench-kit-12v

Having tried one, I have to say the extending wheel nut wrenches are preferable. Most motor accessory shops sell them, but the discount shops like Lidl are generally cheaper.

as torque (the force exerted on the  nut) is force multiplied by distance if you cant increase the force increase the distance, good quality wrench and a length of pipe will remove most nuts. just be prepared if the wrench is not good quality to slip/shear.

my snap on half inch drive knuckle bar is a good bit of kit, 2 feet long and can take loads of force on it