Regardless of How Dry, I'd Put a 4x8 piece of chip-board/plywood on top a matching sized piece of plastic as a moisture barrier for you bike.
I would not be afraid of 90%+ full gas tank using stabilizer in it ON the above moisture barrier. away from spark and/or flame type heater...
Modern bikes have a good safety against changing pressures and if fuel line is Disconnected (FYI) OFF the tank, cap on tightly, I doubt you will have any problems.
Disconnect the battery Ground...
Now that is ME.
IF you weren't worried about it, you would not be asking here.:shock
Just My Way
signed....BUBBIE