We've used several controllers with two Montanas and never have been able to lock the brakes up totally using the slider no matter how much we adjusted the controller. I guess it's the weight of the trailer (just a guess). Is this what you're seeing or does it just not stop quickly enough?
We've put about 3,000 miles towing the Montana with the '05 Ford and I think I finally have the controller set where it works best for us. Ours is set on 8.0. I had it on 7.5 but did a panic stop (traffic light changed on a downgrade at 60 mph) and didn't think I had the brakes tight enough so changed to 8.0. That seems much better. Your 3500RL is a bit lighter than ours so yours might work better at a lower setting but you'll have to experiment a little with it. It always took me awhile to get the brake setting where I wanted it no matter what controller we were using. This one sure is smooth when it is set right, though.
If I missed your point, please post back.
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