This post reminded me that the last time we were out my wife told me she could not get the cutting board to extend (we live on Cape Cod so I know a little bit about humidity). By the way, this might be worth your time even if your cutting board is not YET stuck closed, it could be getting close, we did not have problems when we were in North Carolina, but we do here.
A little about how wood works. The cutting board is made of maple with a finger hold a each end. WRV made them pretty much universal, one end (finger hold) is maple the other is cherry so they could use it for either a dark or light interior, they would just stick the Velcro on the end that did not match the coach interior finish. The main part of the board is made of maple (a very hard wood, excellent for cutting boards). The end piece (finger hold) runs perpendicular to the main boards and has a rabbit cut into it (that small groove you see on the side of the board). It is meant to do 2 things, 1 as a finger hold and 2 to keep the main boards from warping. Wood moves with the seasons, as the humidity goes up the wood absorbs moisture and swells. A cutting board get wider (it does not get significantly longer, due to the alignment of the boards) with moisture. When WRV put the opening in the cabinet for the cutting board they did not allow enough space for the cutting board and the cabinet to swell with moisture.
The cure is remove the cutting board and sand the sides. This has a complication, getting the cutting board out is not going to be easy, it is swollen the full length of the board. I used a 4' wood clamp to force it out, but I would not recommend that unless you are comfortable working wood. Best to put a dehumidifier in the coach, or go to the desert for the winter, it will take some time for the wood to dry out.
Once you get it out sand the sides (I took about 1/8" off each side of the cutting board) so they are flush with the finger hold. While you have the cutting board out you could also put a little butchers (bowling alley) wax on the rails in the cabinet, this will not keep the cutting board from swelling, but it will let it move on the wooden rails in the cabinet a little smoother. Also be sure you only wipe your cutting board clean, do not soak it or submerge it in water.
Below is a picture of the cutting board after I got it out, you can see the board itself is a little proud of the finger hold across the front of the board.
Here is the board after I sanded it flush.
Here you can see the cherry end and the rabbit and the Velcro that I mentioned above (we have natural maple cabinets).
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Dave, Bobbi and Fenway