It's not difficult or as dangerous as you might suspect, at those speeds the water feels just like concrete and the wheels are rolling so there isn't really that much friction. The guy flying, Jon, is 60 and doesn't drink ... maybe he should start?
The tundra ties on those Cubs are cool, I once worked for guy in Corpus Christi, TX that had a set of those tires mounted on a Super Cub so that he could land on Padre Island to fish the flooded estuaries on the island, would strap the rods'n reels onto the wing struts and have the cooler in the baggage compartment for his fish. I went with him a few times and man we did catch some big black drum, redfish and trout from those flood waters.
