Mad Max/Headscratchers

All the MFP officers wear leather motorcycle clothing, yet only Goose is ever shown on a motorcycle. Anyone have an explanation for this?
 * It's possible they're all motorcycle cops, and there's a regular rotation of officers between bikes and cars, to reduce strain on officers from constantly riding a bike.

When Max gets his arm run over by Toecutter, he's reaching for his sawn-off shotgun, yet all MFP officers carry a Smith & Wesson Model 28, yet he doesn't simply use that.
 * He was probably used to using the shotgun, which is why the revolver is not seen, or at least is not obvious, in the sequel.
 * No no, he only uses the shotgun during his Roaring Rampage of Revenge. It's more likely that .357 Magnum ammo is a tad more scarce than 12 gauge rounds in the Mad Max verse.

"Gulag" is one very expensive way of executing somebody. That horse could've been doing something more useful that dying out in the desert.