Trailer Wheels Help

[champ]

The tires on my trailer are frozen (on the drum brakes). They seem to be more stuck this year than before. Is there an easy way to loosen them up? i just take the wheel off and give a few wacks with the hammer. Then elbow grease turning them by hand.

To prevent this I've moved the trailer forward a few feet after backing up, kept the trailer jacked and turned them by hand every once in a while (no so much this year). Not sure what else to do.

Any tips are appreciated.

Thanks