Fixing/replacing corrugated wood that covers hoses when slide goes out

[00wabbit]

My motorhome has this small panel on the inside near the floor by the refrigerator. When the slide goes out there is a piece of corrugated wood that is supposed to slide out with it (like a roll top desk) to cover the hole. The wood piece doesn't slide very easily. I tried to mess with it and popped it out of the track.

Can I replace this with something better? Or what should I use to lubricate it so it slides more easily?

Right now I have it disconnected from the slide so I slide it over manually after outing the slide out so it doesn't get any
More damage

[doc]

Old trick we used to use when the construction company was in business. "grease" the wood with a candle where it slides in or on the other pieces. Oil will penetrate the fiber/grain of the wood and turn it dark. Candle wax (have also used soap) will not. Used this trick a lot back when we fitted and hung doors before the days of pre-hung units. Screws went in a lot easier if you dragged the threads across the side of a candle or bar of soap.