At this time I do as you mentioned -- over the tailgate to the connector on the bumper. I want to have a pigtail (recepticle) installed inside the bed of the truck but it isn't high enough priority for the wife -- grandbabies taking all remaining disposable income before toys (my toys at least
.....
If you can get one put in the bed of the truck - I've seen several that are in the left rear stake pocket and they look good, are easily accessible when hooking up / unhooding, and most importantly, it keeps the umbilical in the bed of the truck.