Steve,
I'm in the same boat. My tank is about 2/3 full. Checked and found about only way to empty it is to burn it off so I'll be using my external fire-pit and BBQ a lot for the next year or so. IMHO I wouldn't try removing the tank w/gas in it. Once empty, mine is coming out. I'll divide the bay into 2 sections; 1 for a small propane tank and the other for 2 more house batteries. If you find a good, quick way of disposing of the gas in the tank, let me know.
Thx,
Steve