As the sucker who required the built-in air compressor of Lvnmarks' DeWalt Jump box, I can wholeheartedly reccomend the device. It's physically larger than the little "phone charger" one above, but I sure was glad Eric had it.
Pretty sure it was this unit right here:
These Hand Sockets have DirectTorque™ technology to help prevent rounding of fasteners and to provide better grip. The chrome finish helps provide protection against chipping and flaking.
www.dewalt.com
In other news, don't follow your buddy through a construction zone when your camper is running 12 year old, worn out, bias ply tires. I mean, I still blame myself, but it's a good life lesson.