If its in a heated space you should have no problem
If there is winter temperature cycling then water will accumulate in the tank from condensation as the tank breaths with every temperature change.
I would take some oil/ and fogging oil and coat it evenly then if stored outside you either have to really seal it so it can't breath OR leave it open cap off maybe even petcock removed so any moisture that comes can also dry out as it heats up.
If you totally anal there are the tank lining chemicals (por I think) that would leave it with a rubber liner which should prevent all the rusting.
After considering this I say
Leave it out open on a nice sunny day let her dry out
Add the oil/fogging oil
Put it in a good quality garbag bag any tie her off
If there is winter temperature cycling then water will accumulate in the tank from condensation as the tank breaths with every temperature change.
I would take some oil/ and fogging oil and coat it evenly then if stored outside you either have to really seal it so it can't breath OR leave it open cap off maybe even petcock removed so any moisture that comes can also dry out as it heats up.
If you totally anal there are the tank lining chemicals (por I think) that would leave it with a rubber liner which should prevent all the rusting.
After considering this I say
Leave it out open on a nice sunny day let her dry out
Add the oil/fogging oil
Put it in a good quality garbag bag any tie her off