Time for some new 19.5 rubber...recommendations?

Wow. Eleven years on tires used to haul a TC. Regardless of the mileage, I would have replaced them years ago. Since you only went 60K miles in all those years, I would buy more medium grade tires and replace them way more frequently. The usual recommendation is 7 years but with low use even that is questionable. The lower the use, the more frequently tires should be replaced. An unused tire should be replaced in about 4-5 years.