Update on Propex:
So this whole saga was unique to my stupid dumb luck.
So my trailer manufacturer bought my Propex from the closest dealer to thier factory in up state New York. This dealer is in Quebec. So after my issues I started dealing with the US distributor in Fort Collins. After going back and forth trouble shooting for weeks due to them only taking propex calls three half days a week and never answering thier phone they finally agreed to have me send (on my dime) my unit to them. So I pulled it out of my trailer with exhaust and intake lines which was a pain and boxed it up. Van Cafe then asks for proof of purchase. My MFGer sends it. "Oh it was bought in CA we can't work on it" wierd vibe at Fort Collins dealer. Kind of like being the US Propex dealer was not fun. The manager did contact me and apologized and offered to pay to have it shipped to them and back. But I didn't as I lost faith.
I reached out to Propex North America and was a bit pissy and the contact was pissy back and said I bought a gray market heater. Never heard that term as I think of Canada as just being a northern state in the US.
All Propex dealers just assume it's improper installation that causes most issues which is likely true. So I did the following which I advise every diy to follow.
Buy 48" stainless lines for both intake and exhaust. If at altitude get the high altitude cap on intake. Run them parallel not in opposite direction for wind purposes. Try to separate line ends as far apart as possible. If you have multiple propane appliances run them on separate regulator at 11-12" wc. Then get a separate Calibrated regulator to 15"wc and run it to propex.
Most importantly buy your kit from Sure Marine in Seattle.
I finally sent mine back to Sure Marine and it had some internal issues that they fixed for shipping cost only. They had to solder a few areas of the circuit board.
Tried to contact the Quebec dealer and the business was sold and no one would admit they sent us a damaged unit. In very broken English.
All good so far.