Counter top came loose

So I went out the clean up the TM (2002 2720) after our first camping trip and noticed that the range had moved and the counter top to the right of it was no longer connected to anything but the range!

We extracted the loose counter top and when we flipped it over, the plywood where the screws are supposed to screw in had large (almost half inch) holes instead of tiny little screw holes. On the back closest to the wall, the holes had completely torn out so that we wouldn't even be able to fill in the holes.

We will probably just move the screw locations for now, but I don't know how long that fix will be good.

Anyone have this problem before? Any suggestions for a good, solid fix?