The 15" tire/wheel will have a bigger diameter than the 14" wheel, and therefore have more leverage against the brake pads. No matter where I set my brake controller, I can't get a trailer wheel lockup on dry pavement.
Buy you don't really want a lockup anyway. The TV has anti-lock brakes that have more stopping power than the trailer brakes because they prevent skidding, and if you actually achieved a trailer lockup in a panic stop, the trailer would be skidding around to one side or the other.
You don't have time to work out the details once your foot is on the brake pedal and things are already happening too fast. So I set the controller like Bill, and I also set it a little lower and drive a little slower in the rain.
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2005 TrailManor 3023
2003 Toyota Highlander 220hp V6 FWD
Reese 1000# round bar Weight Distributing Hitch
Prodigy brake controller.
"It's not how fast you can go, it's how fast you can stop an RV that counts."
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