I installed a "stay awhile" fitting right off the tank on the right side. It comes with a 12' hose that I toss under the vehicle to connect to stove. We fulltime so having the ability to hook to an external large tank sure comes in handy as well. Don't ask how I know that you show add the extension hose to your pre-trip check list!
I did notice while doing maintenance in the water compartment that there appears to be a place where you could tag another fitting onto the existing gas piping system. I believe this would provide low pressure gas as it is past the onboard regulator.
I have a 2018 38C and it has a propane quick connect already installed in one of the bays on the starboard side. The mounted it so high up that you will not see it unless you are on your knees and looking up and to the left.