Heavy loads can require more than a single rear axle. This new Ford patent offers a second rear axle as an upgrade to an existing pickup.

The Ford patent shows a bolt-on kit ... kit to add a second rear axle for the F-Series and extend the bed. Oh yeah, and this third axle can also be driven by an electric motor.

For some, the addition of a second rear ... or "lazy" axle for increased load capacity. The Blue Oval might be considering it as a way to add an electric motor for a hybrid or PHEV conversion ...