don't caulk. The pan should have a lip, The wall sits on the inside of that lip. If there is any water getting on the exterior surface of that wall (behind the water knobs), it should run down the wall and into the pan. If you seal the pan, the water cannot do that.
2001 Coachmen Mirada (Ford F53 6.8L V10) - Toad 2003 Saturn Vue.
It won't do MACH 2, but I can get a sandwich and take a pee.