You should be able to contact Palomino for a wiring diagram to help you. And if the wires and connectors are there it will be easy.
Be advised that your heater fan will drain your battery fast so you will need a way to recharge in the morning. We did the dry camping thing and only ran the heater in the morning to get the chill out to get dressed. Then charged when plugged into the truck as long as you have the plug wired. We have the 7 pin plug.
Jim (SSG US Army Ret.) and Cheri (TSG Phx ANG Ret.) Mesa, AZ
2006 Dodge Ram 2500 HD Mega Cab Diesel | 2005 Honda Goldwing | 2006 35' Dune Chaser 5th Wheel