[bcrvman]

Hi, I am installing a solar system on my 2018 model year Montana 3811MS. I need to pull much bigger wires from the roof to the battery bank. I scraped off the silicon covering the solar wire gland (I think that's what it's called) and was very surprised to see the rust and obvious water damage (hard to see the damp wood). Any of you with the solar prep package might want to check yours out. That's the warning part.
My question is has anybody used the existing wires to pull new wires? As you can see from the picture, those #10 wires they tell you are in there only go about 6" then they are attached to something that looks at least one size smaller. I need #4's so need to use the old wires to pull the new wires. I cannot see any wires that look like them when I take off the inCommand in order to see behind. It is full of wires, but most are 110 wires.
Has anyone been able to locate the right wires?