Excellent brake life!

[4S50]

96k miles, and I estimate I towed my 4500-5000 lbs trailer about 9k this year alone. The front brake pads looked like they would soon be due for a change so I decided to get it out of the way, replacing them with Powerstop Z36 truck & tow. They had probably 20% left, but the rears were really amazing, probably 40-50% left. That Curt Echo is pulling its weight, haha.

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[ShadowsPapa]

If you have your trailer and trailer brakes set up correctly, there should be almost no appreciable additional wear to the tow vehicle brakes.
Off-roading is a lot harder on brakes than towing if you set up the trailer brake controller properly.
Towing 5,000 pounds I don't feel like the truck brakes are working much harder.