I would sanitize and empty the tank and you should be good.

I would add a little bleach to the tank and then fill it the extra bleach should keep it clean and if you lose water at the RV park you can just turn the pump on use your water.

I usually do what RVsolar said, I add about a cup of bleach to my 60-gallon tank and keep it full, at least I have dishwashing and toilet water if the park water gets turned off for maintenance, I also keep some drinking water in jugs. Another benefit of having the tank full is it adds lots of weight to the rig to help keep it more stable in the wind. Then when it gets close to departure I flush it out a few times.

All good ideas, no one has said to left it empty like it is now. Is that a bad idea? oh by the way I have more than enough weight for stability so that's not an issue.

Most seasonal RVers leave them empty all winter long to avoid freeze-ups, then they just sanitize them before they start the season. No harm.

That's the answer I was looking for, thanks Ray.