The Caltrans yard in Blythe has a boat with one of those on it. It is the only one I ever saw. I am a surveyor and this must have been around 1993 or so. The last time I saw it was parked right by the fence on the street if anyone ever wanted to check one out.
I parked my old boat in there right next to it for a few weeks one summer. We used to work that part of the state from San Diego so we'd stay the week when we had a lot of work. For those weeks we worked from 5am - 3:30pm and then we'd launch the boat (with my van) for a few hours to ski and hang out. We'd pull it about 9pm and do it over again!!
Oh to be 22 again!! These day's, I definitely would struggle to put in a 10 hour day surveying in the desert's summer heat and then go cruise the river for 5 hours.