I already bought the panels, cable, connectors, and such, so...
And I'd have to be concerned with weather proofing a 'mex-izmo' attached to a panel, although I had considered going 24v (2 panels in series) to save on cable.
I'm making two sets of cables, about 20' and 30', to make up to 50' total when needed, so I'll have options.
I like those 4/8 circuit breakers snowman recommended. And I would think one could simply screw down some 6ga in there, instead of 4ga. Plus, I can always make my own "pin terminals" by modifying heavy duty ring terminals.