Bear in mind that the whole core of this thread is that the vehicle in question, mine, had almost no muck on the underside at all, I've worked underneath muddy vehicles and it's not nice, but this wasn't one of them. I looked underneath myself and I'd not mind going under on a car creeper, much worse than working on a car on a car lift.
Their specific claim was that they couldn't see the chassis for mud, which was total and utter bollocks.