http://www.batterychargers.com/detai...A&catid=13
I travel solo a lot, so part of my travel kit has been a portable jump starter/12V power source. I have carried a Shumacher Mighty Mite for four years in the trail rig, and it's been used numerous times to jump start a battery, and as a power source for a 100W rechargeable spot light. It will run a rechargeable 100W light longer than I want to stay in the local mine shafts. (most of which are now closed and foamed shut )
I've found that it holds a charge for about 4 months, so the upkeep maintinace is really very easy. The unit plugs directly into a standard 110V cord, and charges overnight.
I found one this weekend for the '98 Taco at our local ACE Hardware for $49.99, a lot less than the MSRP.
While this unit doesn't compare to a dual battery system, it offers a lot of portability and sufficient power to get a flat battery going again. They can be stored in any position, anywhere in a vehicle without fear of leaks or fumes.
Later