Greetings, currently I have an extremely heavy gauge "pigtail" (male outside, female inside the rig that I have ran up through the bottom of my Transit behind the driver's seat that I use with a an additional, male/female ended cord to an external power source. I use an industrial grade 3 way plug on the inside of the van for my shore power. It works excellent for running my portable A/C, or space heater etc. When needed. I am looking to install something more permanent and less tacky looking and have debated on other options. Primarily a residential, 4 breaker panel box wired into a 4 outlet j box has been rolling around in my head as a solution. Has anyone done something like this with any success? Is there anything out there commercially available to fill this roll that is right out of the box ready to wire up, say van/ RV specific? Any help on the subject would be greatly appreciated!