well you could use a Carnetix 1290 if the dell isnt one of the new models with proprietary connectors.
Otherwise i would hard wire everything to a multiple cigarette lighter adapter mounted below the seat. Leave it hot at all times. Get yourself a battery saver that cuts power to the car if voltage drops to a specified point.
I'd run the Dell off of the 1290 so it could incorporate shut down controlling and hardwire everything else