I thought the season was over -- the season of pulling people out of the river at my campground. But a rear-wheel-drive Ford Transit van got stuck just after its drive-wheels hit the water. It's true that he chose the wrong place to cross.
Remembering what I learned from experimenting with a Nissan NV van a couple years ago, I told him to turn off the traction control switch on the dashboard. Naturally he had no notion what that meant. But he finally found the switch. By turning off that switch, the traction control system was supposed to surrender its capability to throttle back/down the engine when a wheel starts slipping. Still, it was supposed to apply the brake to the slipping wheel, thereby imitating a limited-slip differential.
But that isn't what happened in practice, with the Ford Transit van in the river, where one wheel still slipped, while the other was completely stationary -- just the malaise of an open differential, in olden times. All this occurred in reverse gear.
Then I had the driver turn the traction control system back on. No difference. But the tow vehicle, a Toyota 4Runner, and several men kept working on it, until they succeeded in backing the Texan (naturally!) out of the drink.
I guess I need to study the owner's manual for the Ford Transit van. So far, it would appear that their traction control system was completely inoperative or useless, at least in reverse gear.
This was disappointing. Unaccustomed as I am to being a cheapskate and trying to beat the System, I used to scheme about buying an unpopular and inexpensive two-wheel-drive pickup truck or van as my next tow vehicle, and then hope for modern traction control systems to overcome the "one wheel slipping" syndrome. That appears to be a false hope.