Thank you everyone for the info. I have some reading to do now. As for your question Brad, my fridge has the 12v option but I plan to mainly run it off propane.
Based on the info I have thus far, it sounds like I need to buy 20+ feet of 8 gauge or bigger wire, possibly a constant duty solenoid or a battery isolator (still need to read a bunch on those to understand which I need). I have seen some folks take the positive and negative wires out of the Lance harness and wire those up to the battery, while just using my existing 7 pin in the truck bed for the running lights. This makes sense to me, does anyone see any issues with doing that?