What ramp do you use?

Dwight Frye

After seeing the photo that anthonyy posted I'm tempted to buy another set of Rhino ramps and use them the same way when I do the transmission and differential oil changes. I think if I drove the front wheels up first and then used a floor jack under the differential I could jack up the car, slide the rear ramps under the tires and lower the floor jack. They are about the same cost as jack stands and the adapters for the pinch welds and seem like there is less chance of underbody damage, plus they would keep the car level during the oil change process. Anyone see a flaw in this method ?