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Everyone has their own tricks that work. I am surprised that your wires fail after two years. Over the years I've done quite a bit of trailering and launching over 100 times a year in saltwater. On one of my trailers I ran sections of old garden hose through the trailer frame, ran the trailer wires though the hose and then filled the hose ends with marine caulk. I greased the light sockets and plugs and heat sealed all wire connections. Most importantly I maintained a good ground. It seems to me that perfect grounding is one the the key items.