I was recently reminded of an unusual 6-wheel vehicle that I saw in San Francisco. It was so intriguing, I got a ticket for a 90 minute ride on the DUCK.
This was one of the original refurbished WWII Amphibious landing crafts which was used to transport soldiers and supplies over both land and water. In more recent years, these crafts were used by police departments, fire stations, and rescue units in San Francisco. Now, they are a tourist attraction.
It was great fun riding through the streets of the North Shore of San Francisco and then driving right into the water and taking a slow tour of the Bay as well. Finally, we were amazed at how the craft climbed right out of the water and made its way back on to the busy city streets to finish the tour.