Thanks 'NVDucati'! It's hard to make out the driver/skipper. We Amphibians are a pretty tightknit group, so I'd likely know him from our "Swim-In" gatherings, our our own online forum. One of our major luminaries, a great fellow named Roger, who's likely restored more Amphicars over several decades than the number of times I've sailed my 26X, is up there in the Ozarks, but I don't think it's him.
As for Amphicars in rough weather, they actually don't do too badly. I've been caught in some really nasty squalls, one rough one in particular right on the Potomac was quite memorable, without undue alarm. With one's four keels (the wheels) and top up you'll be just fine, as were those four British madmen who crossed the Channel in '65 during a Force 5 to 6 gale, and then carried on by road to the Frankfurt Motor Show. Unlike billionaire Richard Branson's subsequent record attempt crossing in some quarter-million dollar successor amphibian just a decade or so ago, I don't believe the two Amphicars needed to be hauled up and off the beach. See:
https://www.amphicars.com/test/default.html