@triumphrider
In the case of the Automatic Ready Power unit the engines only job was to drive a generator to keep charging the battery so the forklift could work the total work shift. The only units I saw in my tenure in the industry was some large capacity (20k to 30k) Autmatic electrics used was at Aloca plant near Evansville, Indiana (not far from Santa Clause, Indiana). This units handled aluminum sheet rolls & loaded the on a flat bed via a big fat coil ram.

As I recall when Eaton Yale & Towne bought Automatic they sold the huge electric portion to Silent Hoist or possibly it was Ewell Parker