Well, the snow thawed a bit this weekend so I figured I'd back the trailer up to its official parking spot in the yard.
Plowed away some remaining snow, backed up the trailer, leveled side to side and left a slight ( 1/4 bubble) pitch to the rear. Then I started looking underneath to see about mounting some PVC for the sewer hose and noticed that only one side of the axle is wired for brakes. It's a bit muddy out still so I wasn't able to crawl under and look, but I see lines coming from the frame to the drivers side axle, and nothing to the passenger side.
Could it be they ran them along the axle and have a hidden connection? I'll look better next weekend but figured if post here and see if anyone has had an issue or knows where better to look.