I can't help but keep hearing you say "two tires." If the Overlander is a tandem axle as I suspect I would go ahead and replace all four tires at the same time. If they are checking then it's time to replace 'em. Tire blowouts do really expensive and ugly damage to AS aluminum! Ask me I know from first hand experience.
Once the trailer is in place you can cover or remove the tires for long term storage.
I was just in your neighborhood last month! Hope you're going up 101 to 20 to get the new AS home......
We drove 1 from Legget to the GG Bridge...
Hope you have a safe trip back with your new prize.
1984 28' Funeral Coach
Former Rolling Showroom & PuttLab (now party bus)
"I'm not an expert. But I did sleep in an Airstream last night."