API
The solid tire is the way to go, years of abuse by me has shown great service on both my RV4 and now my Rocket. Personally, I love the Aviation Products Inc. dual fork tailwheel. It has a higher ground clearance than all of the others. When you operate on turf, gravel and mud 80% of the time as I do, it's invaluable. API also sells a solid tire with sealed bearings that is of stellar quality. Vince's TW and tires have given many others great service. Both Vince and API are small, home businesses, the heart of America.
Your call..
Smokey
HR2