Where are the 12 volt plug ins in the 5th? I don't remember seeing any... The humidifier is detachable. It is a Respironics unit. We won't have a generator or inverter. I thought there was a 12 volt recharger that you could use in your truck that would recharge the unit, but I don't see any, I'm just seeing expensive battery packs. Thanks for the ideas so far!