The heater was making a really annoying screeching/squealing sound so we pulled it out to take a look. I figured it was a bearing on the fan making noise but all the bearings seemed in good shape and spun smooth. Cleaned some dead bugs out of the case and intake but couldn't really locate anything that I thought would be making a noise like that.
Got to looking at how the heater is mounted in the camper, its supported by the cabinet framing in the front but there's nothing supporting the rear of the unit, it was just hung off the two bolts that secured the exhaust/intake to the exterior of the camper. So my dad made block to support the rear and its all quiet now.. weird.