Hi Joey, since he's in the truck a lot, you might wanna consider a passthrough eGo Passthrough @ Vapor Talk . He can use it all day & night in the truck and unplug it for use at the many roadside diners.
He would need to get one of these USB Cig Adapter to plug it into the cigarette lighter.
I would stop using that method! Remember whatever you put in it you will not be able to rinse it completely out. The reason you started using an E-cig was to get rid of 4000 chemicals that are present in cigarettes. I would hate for you to have a health problem down the road because you just didn't know better.
Best cleaning method is using a bulb syringe and plain water. There is a video on this forum.