I'm working towards getting a mobile rig for my truck. I've looked into the different ways to wire the power up. It seems like it would be easiest to wire from my fuse box for the positive line and find a connection that powers off with the key. Would it be better/safer to do it this way, or wire straight to the battery with a fuse at the battery and remember to turn my rig on and off? Also, if I wired to the battery, is there a way to get the power to cut off when the vehicle is off?