Some vehicles, like my new Jeep, require the negative battery cable to be disconnected when being towed to prevent the dash lights from draining the battery. There are electronic devices and switches available to prevent this problem, but they are costly and have their own potential problems.
My quick fix was to replace the battery cable bolt with a quick-release seat binder bolt from a bicycle shop. They generally come in two lengths; the shorter one will work the best and mine only cost $7. Now, the disconnect and reconnect that used to take minutes has been reduced to seconds.
Tom Duke, Atlantis, Florida