[King Prout]

electromagnetic suspension would be heavy and require electricity.

think in terms of replacing "wasteful" mechanical suspension (which converts some of the reciprocal kinetics into radiant heat = loss) with exploitative mechanical suspension technologies of the same mass and volume.

[NicknamedBob]

"...electromagnetic suspension would be heavy and require electricity."

Au contraire! The suspended weight would also be a magnet, and every bounce and jostle would generate a surge in the surrounding coils! -- Check this page!