haven't looked into propane conversion in awhile but I had also considered a conversion.
there are companies that have kits to switch from gas to propane but none seemed fully reliable.
What I found at the time, it would be $$$$$ to do a conversion and fitting a fuel tank out of harms way was not possible.
Well, possible but no way I would want a pair tank in the cargo area of my JKU. The other option was to remove the gas option completely and but a tank in it's place at the cost of ground clearance.
back in the 80's, I worked for an outfit that ran all their vans on propane. The tanks were big and heavy . Also had to have the suspension modified and they required a large tank to make up for the loss in MPG's.
On the plus side, if we ran out of fuel we could grab the BBQ propane tank, stick the hose in the carb and off we go lol.