[SteveC7010]

The "lock the brakes" test of a trailer and brake controller is supposed to be done on gravel, not asphalt or concrete, and at about 15 MPH. As Steve just said, the heavier trailer pretty much precludes a true lock-up at that speed on asphalt.

I could lock up the brakes on my 25' Sunline (5,500# GVWR) with no problems, even at low speed on the highway. Had turn off the boost when towing in 30 MPH zones because they would lock up so easily.

I am using the same Prodigy controller with the Cougar and so far, no lockups. But then I haven't towed it in stop and go traffic either.

I have a friend who did a very precise upgrade of the brake wiring on his trailer. He used larger gauge wire and measured it in identical lengths for each brake. He said the improvement in braking was significant. It's on my list of things to modify this summer.