Great topic, but I think in the end whether ramps for stands are used the most important tool of all is COMMON SENSE. If you think there is an issue, there usually is.
When I lift any vehicle, with any device, jack, lift whatever, once I have the vehicle in the air, before I climb under I give it a healthy shake, and think the following to myself: "Can I safely work on this with my kids climbing all over?" If the answer is yes, I get to work.
