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As for inconsistent performance, I've had surge brakes on several trailers, and have have very consistent performance - awful. I always seem to be buying used, and the brakes are as these were, rusted. One the ones I've repaired I got fair performance out of it, as it didn't seem to push the tow vehicle, but backing up was the pits. So, I have high hopes for these electric ones.
I've towed a few Uhaul trailers with surge brakes with varying degrees of success. Two of them had nonfunctional brakes which scared the crap out of me, and the rest were pretty decent. We bought our boat new five years ago, and we chose this specific model because the trailer had brakes and we were going to pull it with a minivan. It's a Shore Land'r trailer with hydraulic disc brakes, and they've never disappointed. Scaled the boat once at 3,280 lbs on the 3,500 lb axle, so add some tongue weight and gear and we're over 3,500 lbs. Both minivans could stop this boat nearly as fast as they could unloaded, so I highly recommend this kind of system. It uses a 5-pin wiring connector, which is similar to a 4-pin but with a reverse circuit. 12v on the reverse pin activates a solenoid that deactivates the brakes so you can back the trailer without issue.
We had an actuator problem the first year we owned the boat, and the replacement actuator had a bad reverse solenoid. Otherwise they've been great.
Tom - Haven't seen brakes like that, but they are surge disc brakes with a lockout when you go into reverse? Good feature, although most connectors I've been around don't include reverse.
However, I like the electric brakes as that allows the truck's sway control to bring them on if needed. My reading says that it isn't too unusual when a big truck passes you for the sway control to kick in and prove that it is on guard.
Just so happens that we had the boat out today, so I snapped a pic of the connector. Just like a typical 4-pin with a reverse circuit. I use a 7 to 5 pin adapter and it works great.
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