PD instructions suck, but lots of good instructions posted by others on the web. I got talked out of the WFCO due to the number of quality complaints I saw on it.
I bought a separate negative 12V DC bus bar. I am glad I did. Made wiring a lot cleaner. I mounted the bus bar outside the PD 4135 box.
I did not find it hard. I did redo shore power inlet, 10G wire, plus 30A surface plug on the outside of my trailer. I detailed it on my Trillium
FB page: bills 1977 trillium
I believe the PD and the WFCO are the same size hole for mounting. In my case, I was replacing the old PD-6911, so the hole was taller and narrower.
Given you have an AC, I think you would find 30A an advantage.
Your 3 way refrigerator
, one way is 12V. Most furnaces use 12V for the furnace
controls and fan. So you have a little more 12V than you have listed (still not a lot). I added a dual 12V outlet, which I would recommend you add as well. I use it for a 12V portable fan and for phone chargers.
Randy at Best Converter did his best to talk me out of a WFCO. He claimed he has had to warranty a lot of them. So I cancelled my WFCO. I then found a better deal elsewhere on my PD4135 (bought it on eBay for $127, seller is now $133 shipped, still the best price I have seen).