Since I have owned this truck, I have been stuck using a clunky power inverted with a USB port on it to charge USB devices. This is super annoying. Cords everywhere, and I don't use the AC socket at all. To finally remedy this, I replace the cigarette lighter with one of these. It fit pretty well with a bit of modification, and is working quite well.

One of the biggest problems is safely powering the various microcontrollers and such I plan on adding to my truck in the near future. Their job will be to monitor the vehicle and alert me to any possible problems, such as low oil pressure, high transmission temperature, or low system voltage. The Arduino Mega I play around with will handle up to 20 volts DC, but I hardly trust the 12-15 volt DC system in my truck to supply clean, regulated power to delicate electronics. That's where these USB sockets come in. I will also be adding an in-line, 5 amp fuse, and a power switch for each bank of ports, as these are connected directly to a battery circuit and I want to be able to control their power consumption manually. At this time, the phone charging USB bank is hooked directly to a battery circuit with no fuse or cut off switch. It has sat overnight twice now and has not drained the battery yet.