Collector car insurance

My understanding was that USAA does not insure classics but has a partnership with American Collectors. No USAA member discount and the vehicle does not count toward a multi- car discount.
That's an accurate account by my experience. I was free to use any collector car insurance I wanted until I got the liability umbrella policy. If I exceed the liability limits of the collector car insurance, the umbrella policy kicks in. For them to agree to write the policy I had to switch my Barracuda coverage to American Collector's.