I installed an 80 amp relay and motorcycle battery in parallel with the main car battery. The relay's key is connected to the accessory line in my truck. All fixed!!! Man I wish I had done this months ago. So nice to stop for gas or whatever and not have to reboot the darn thing.
2002 Z-71 Rolling with an ITX MOBO, 10.4" touchscreen, 40 Gig HD, and a DVD ROM.