i use the craftsman bolt-on, which has many different attachments. i keep it and the charger in the TT at all times. i use the drill attachment for raising/lowering stabilizers, use the inflator attachments for tires, and I am probably going to get the impact attachment for changing tires (though I don't mind doing this manually for now). It has worked great, and with a spare battery and a quick boost charger, it has been more than sufficient.
i have a backup cig lighter plug in inflator that i got pretty cheap, keep that in my TV just in case.