OK I don't like doing the screwdrivers one in the first picture and in fact it is someone else's picture.

I use a 12-volt electric impact wrench from harbor freight. It is made for wheel bolts and nuts for tire changing but works almost as well as a pneumatic impact wrench. On the old ones you plug into the cigarette lighter.

Harbor freight has this one with that uses AC and has a cord: CHICAGO ELECTRIC POWER TOOLS 7 Amp, 1/2 in. Impact Wrench with Rocker Switch, SKU: 61173
Now that I know they are so cheap I am going to get one. Won't help on the road but for use at home.

I do not look like they sell the 12-volt ones that go into the cigarette lighter anymore. I used to have one of those in each car to make tire changing on the road faster and they reduce the effort during tire rotation.

Attached Thumbnails

     

__________________
84 300D, 82 Volvo 244Gl Diesel