DJ
A larger tank will help. I use 100lb tanks. They hold 20 gals of propane and eliminates freeze up. One tank will last for 3 days of forge welding. Thats about 6 hrs a day so 18 yours. That is a little over 1 gal/hour. my forge is 8" id and 18" long with 4" of cerachem wool and a layer of castable. Freezing is common if you are drawing gas too fast so the old slack tub trick works well also. Like you said just keep it from tipping. Wayne Goddard goes even further and puts a heater into his slack tub.
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