Will be wiring this thing up fairly soon, after I finish up the painting and add some plywood. I bought a pre-made wiring harness that seems pretty nice - but I'll still need to make a few splices. Its been about 40 years since I last wired a trailer, and I don't remember how I did that one other than I did it from scratch. What's the accepted "best way" to do splices on something like this these days? Solder and heat shrink? Or is there a new fangled miracle waterproof connector that I don't know about?