Did a quick search and everyone seemed to have a suggestion for a conventional latch style coupler, but I want something solid for a surge tongue. I've looked at the trimax(mixed reviews), and the Reese, but havnt found anything that looked solid and durable. Had a couple people suggest Bolt for their key comparability, but they don't seem to make a 1/4"x3.5"ish lock for a surge coupler. What have y'all found to be the most durable/secure for a SURGE tongue?? TIA