We use our triple axle boat trailer in salt water all the time. Over the years we have seen many so called sealed tail light and marker light assemblies fail miserably due to salt water intrusion. Whenever I replace lights on our trailer I soak test them. These failed about 2 days in 2 feet of tap water with lots water intrusion into one of the two light assemblies, so I will not be attaching them to out trailer
(3 of 3 people found this review helpful)