Sean,
You should visit the storage facility and get the date code and tire size off the sidewall of the tires. If the tires are older than four years, you should give some serious thought to replacement, no matter what they look like.
When you are inspecting the brakes, it's a good time to repack the wheel bearings, especially if previous maintenance is unknown. Along with these maintenance tasks, it's a good idea to check the emergency brake system and the condition of roof sealing, battery condition, refrigerator and furnace operation.
Happy trails!