Here is my new take on a power drawbar. I did not opt for the common Pneumatic variety. Instead I went with a Cordless Impact driver. On the cheap!

Total build cost me $5 for the switch and a impact driver I bought as a disposable tool for a job (cost me $60). and some scrap metal.

Its a proof of concept design and needs some refinement to clean up the motor and wiring.

[nomedia="http://www.youtube.com/watch?v=G0VK3lQwLwc&feature=youtube_gdata"]YouTube - Power Drawbar[/nomedia]