I have had a 295RL for almost a year. There were a few minor issues, mostly cosmetic. I think the Columbus has the best looking 5th wheel out there and the bang for the buck. It has a LOT of features for the price. All RV manufactures are going to have a few bad ones built with poor quality and those are the ones you hear about. There are lots of happy owners out there and - so far I am one.
Here is a picture of the factory pigtail.
It looks like a 3/8" female flare fitting on the end.
You prolly need something like this:
Would the vents on a box like the NOCO and the hole underneath, where the 12v used to reside, be enough or do I need to find a way to connect the vent hose to the top? How have others set theirs up after switching from 1 to 2 bats?
I added a vent to the top & bottom of the second battery box with PVC fittings and radiator hose.