Look here for a cool E-brake solution. The device pulls with about 600 lbs of force. The unit mounts to a frame rail under the car and can be adapted to most ebrake cables including Lokar. HR&CS sells quite a few of these and have them in their booth at shows.
hotrodscustomstuff.com | HR&CS Announces E-Stopp
The device also makes a neat anti-theft device, set the ebrake and cut the power via a hidden switch....with the back brakes locked, it is harder to roll the car into a trailer.