I have a National 2000 seaview 31 ft.and at a recent inspection was told I should thinks about new brakes rotors and pads. The vehicle weighs 17000lbs and I have towed a dinghy (2800lbs) about a third...
Hard to imagine your brakes needing replacement at 50,000 mile. I had someone trying to sell me a brake job on my Jeep which has 28,000 miles. Most of my vehicles go about 100,000 miles before needing pads. A persons driving habits make a big difference as to how many miles a set of brakes will last Second opinions are always a good idea.