Things you did not know you needed/wanted that are useful, fun, interesting, not specifically trailer related or maybe are.
I bought one of these which tells me the voltage and amperage of current draw of your USB devices, reassuring your cell phone, Nook what ever is not being cooked and very nicely tells you when your device is fully charged. This is used in our bricks and mostly sticks and in the tear.
So what DoDad have you found?
