Hi everyone!
This is my first post on this very interesting website.
In regards to use of a pneumatic tail wheel tire, someone else pointed out the Aircraft Specification sheel # A-773. On Revision 10, it state that a Maule Hub and Axle Model SFS-P8 can be used. This includes a pneumatic 8.00 tire, or 8 x 3.00, 4-ply tire. As with any like change, the weight and balance would need to be updated. The Maule unit comes in around 7 lb.
Eric D