If you supplemental braking system is properly set up there should be no additional wear and the brakes should last a normal length of time. I have been towing a 2011 CR-V for 10 years behind two different coaches and the brakes show normal wear for 60,000 miles. Most of our miles are open road and the brakes are probably the least used part of the set up.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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