I have been using power pole connectors for years. Most of my connectors are for 12v systems, and many hobbyists (like Ham) have adopted these connectors as their "standard". These connectors are available in 15A, 30A and 45A options which are rated according to the cable size used. These 30A connectors accept 12-16 AWG wire and work best with a crimping tool that handles bare terminals. Also, these connectors are manufactured to tight tolerances, so they can be a bit tight when assembled (just like the brand name). Sides in a connector (or on top of each other like I've found with portable solar panels). I've used several sets from this kit and they all fit perfectly with my existing bushings and I can't say I have these and others.
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