I keep one of the jumper battery packs purchased on sale from Sears behind my passenger seat. It takes a long time to charge again once it's been used, but it has worked like a charm on a freshly dead battery (lights left on). It certainly beats waiting sometimes an hour for AAA to come by in a truck and do the same thing. I do have AAA Plus just in case.
I also use it for very long trips with the kids and a portable DVD/TV unit. The pack keeps their toy going for a solid 4 hrs and leaves my car alone with no wires running up to my ashtray. It's also great for running the little pump/compressor from Coleman for those backyard toys that are too big to blow up by lung, when I don't want to lug out a real compressor.
Anyone with kids and a 300TD can vouch for these items.
