Ya, this dump truck: 148 gal, compared to honda fit's 11 gal tank. That's like 13x. Tho the amount of energy on board only affects the range of the vehicle, so it's not that interesting.
You need enough charge to drive a short distance and do some maneuvering with a full truck, unload, get uphill with an empty truck, and get it loaded and drive a short distance fully loaded to the slope. From that point on you're back to charging the batteries from regenerative breaking while you're rolling downhill.
That sounds very doable in the battery charge that allows a Tesla Model S to travel from LA to NY.
