Any good tutorials about making working tank treads with suspension (spline system?)

Or just whole or complete tank tutorials in general?

It slipped my mind, but epic store has released an M1A1 tank free awhile back. M1A1 Abrams Tank in Props - UE Marketplace

At first I thought it was just a mesh but seems it is fully rigged and has the full track and much more. Now to look under the hood and try to figure out how it works.