My original disc brakes lasted 7 years with changing pads a few times as the the only maintenance. They were Kodiaks and I repalced the with the same. Didn't go to SS since the others lasted quite well with constant salt water dunking. Mine get rinsed every time (in or out) they get wet since the ramp I use is only about 200 yards from my property.
One thing I did learn though is to only use NON-METALLIC pads (or shoes). The original ones locked up within a year and I assume that they were probably metallic pads. The pads rusted right to the discs and locked the wheels. I always use the non-metallic ones now and have not had a problem since.
By the way, before you trash your trailer brakes, you may want to check you state regs. Many states now require brakes on all trailers above 25 feet. Getting fined on the road is not the way to start or finish a trip to the water!
