UPDATE: I’ve added some photos of an actual Portarator.
Merton Day obtained this brochure years ago. It’s not a jeep specific item, but it is easy to see how one of these generators hooked to a jeep could prove useful. The Portarator was installed in the engine compartment for power tools or other electric devices (such as a margarita blender, should the mood strike).
B&B manufacturing produced other Portarator products, as this brochure demonstrates, but I couldn’t find any Portarator’s for sale. Here’s the brochure Merton saved: