AJ I would not put Stabil in the tank, but would drain the tank and due everything possible to get it ready for long term storage.
With my back surgery coming up (found out will have to have 3 vertebrae fused) I have talked to a local dealers tech I know real well. He told me what to do with mine or bring it in and they would do it.
Don't remember all of it but part was draining the oil reservoir, running gas pres. threw the motor and draining the fuel tank.
Store it and don't sell or as stated above sell & stash the money so it collects interest and add to it when you can...........SO you can get another one when you are ready. But with the cost of the new rigs, my suggestion is keep it. Keep enough insurance on it so if something happens while stored it is covered. Drop the rest of it or what you can due to it being financed.
Just an old coots suggestion