Our campers front wall looks like that, exposed 1x's behind the water heater, water tank. The left side is small cabinet behind jack and 1xs are covered. Ours they aren't the structure but added on face for supporting other stuff.
My vote is though 20 years old, has some issues and doesn't help how to fix- but it really looks like p/o hit something pretty hard and pushed/twisted the nose back into the weakest area. Hows it look behind the refer vent?
Even on a sound camper your going to have some bobbing between truck bed and cab-should be 2-3" or better between cab and camper nose.