My old trailer (25 years old) needs new boards and lights. Using new treated lumber that really fits tight and new LED lights. When the boards fit tight, I use putty knives to guide the last board in. Totals cost, Lumber, tail lights kit and wood-to-metal screws ~ $265. Total labor time about 5 hours. I took my time because I was just getting over a sciatica nerve problem that lasted more than two months.