MyFishFinder.com Just like iceshanty but warmer
Try this get a sports wrap with a pocket for hot or cold packs then add 2-3 hand warmers in the pocket wrap around the tank this should fix your problem, little tuffer to wrap on a buddy heater but you should be able to go from there and get it to work...
It happens in our portable, but usually takes a while, today in the wooden shanty though, they were freezing up in 20 minutes! Makes for a cold day when your propane is running at a drizzle!