I was reworking my plumbing system and removed the back wall in my basement. I'm not referring to the false wall that covers the water pump, water heater, etc. This would be the wall that goes from side to side across the camper on the backside of the basement.

Anyway, I noticed this HUGE gap that I hadn't previously noticed. What you see through the picture is the backside of the sheet metal fender next to the stairs (between luan material and black material with staples).

This could apply to any 5th wheel. I shoved a pool noodle in there for now, but I plan on putting a piece of wood and then expanding foam to seal it off.

Luckily, I have no evidence of rodents, but talk about opportunity for them. Click image for larger version. 

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