Spring has sprung and trailers that have slumbered through the winter are being dragged out of storage and dusted off for use. Check the air in the tires. Light up the lights. Yes, we're good to go for another season!
Experience has taught me that "spring cleaning" seldom includes the trailer's surge brake. I would set up at a brake check and start waving in anything pulling a utility or boat trailer for inspection. It did not take long before I found a trailer with serious problems or even no functioning brakes at all.