I remember watching the tv show "fall guy" and he had something like that which I always felt was clever.
I vaguely remember the truck but I remember Heather Thomas a lot more.
Good call on the trailer connector. I had to replace the 4-flat on my truck in the middle of the polar vortex as I needed to use my trailer. The guts had completely corroded away. From now on it's sealed connectors stuffed with dielectric grease.