Tony,
The tail wheel doesn't need any air.
I used to run 30 psi in my -6 because with any more pressure, the gear would oscillate (vibrate? wobble?). After a couple hundred hours, I thought that since it's a harmonic vibration, why not try a much higher pressure? So I went for 40 psi, and that works well. And I have less tire wear.
Heinrich Gerhardt
RV-6, 351 hours