subject of Field Approvals for main or tail wheels...
approvals have indeed become more difficult in recent years but
of all things tire modifications and especially tail wheels on
general aviation aircraft don’t seem to be the subject of
any intense scrutiny. Tundra tires in general are the only field
approval for which there is a system in place for application to
the FAA. The Tundra tire work sheet is part of the fairly effective
established system. We still do them pretty regularly and also
have an LDER on staff to help if needed.