It depends on how you drive them. I see guys with those bigger chassis make brakes last forever and other guys needing them twice a year. Obviously, towing makes a difference too. I have a few business class trucks for I use for work and personally I won’t even look at one that doesn’t have air brakes unless it’s a steal if I plan on keeping it. Two different tree service companies, two boom trucks that both tow comparable chippers behind them, both have hydraulic brakes and ironically the guy that makes his brakes last has no brakes on the chipper axle and other guy has working brakes on the chipper and needs brakes on the truck and chipper all the time.