Never heard of a touchpad going bad.
If you look up under the dash on the driver's side, along side the left wall where it meets the front end, you should see a little black box, about 2" thick and 6 " wide by maybe 8" deep. It should be screwed to the wall. It holds the controller for the touch pad, and it is a very poor design, as any condensation on the inside of the driver's windows will run down the wall and collect in the bottom of that black plastic box, where it shorts out the Atwood controller. Also, all of the connections go into that controller on the outboard side. You'll see thick wires for each jack, power cables, and the cable from your touchpad. The connectors are also very susceptible to corrosion due to the same issue of being mounted up next to the wall. I'd climb under there with a mirror and a flashlight and see what's going on. If you see corrosion on the wires/plugs connecting to the box, you need to pull it out and take a look at the circuit board.
None of this is hard, it's just a tough place to get to.
Jim