The fuel tanks on the four XJ i have own have all been metal tanks with plastic covers.
NO NO do not drain the fuel. Actually fill it up then put stable in it. If the tank is empty condensation will build up and rust out the tank. Definitely get the tires off the ground though and disconnect the battery.
get the tires off the ground so you dont get flat spots in them. if your going to be gone as long as i think id almost drain the gas. where is it going to be parked. will it be covered or what?
I secured a spot in my sister's garage for it to rest while i'm away. Anyone have any ideas on how to get the tires off the ground? Dismounting them and leaving it on jackstands makes me feel uneasy