Do you know what sort of hubs and rotors are fitted to your trailer?
Trojan provide a bolt on style of stainless-steel rotor which has been specifically designed to prevent corrosion and extend the life of the rotor in marine applications. If your trailer is fitted with the standard cast iron style of rotors, your brakes will be more susceptible to rust, especially if the trailer is stationary for an extended period over winter. This will drastically shorten the life span of your rotors. It may pay to check if your rotors are bolted onto the back of your hubs, if they are it can be as simple as removing 5 bolts to upgrade to the stainless version rotors. If the hub & rotors are one piece, then all is not lost, Trojan 2-piece stainless hubs and rotors were designed to retrofit onto many one-piece versions on the market.