On Wednesday, April 23, 2014 11:00:50 AM UTC-7, Colin Roney wrote:
Any ideas regarding the best material to line the inside of a fuselage

dolly which will allow the glider to be slid in or out.

Depending on the trailer and glider, you may not want to use all felt. It will slip around pretty easily. That's why Cobra, at least on many of their dollies, uses a band of foam rubber like material in the middle - to give it enough friction to stay put.