the guy who got killed at the start of this thread probably would not have purchased one, since he didn,t even have decent jack stands,
but its silly to think how little extra expence it takes to save a life
http://www.creepex.com/indexEN.html
now heres a TOOL that at first glance may seem silly, BUT the more I look at this the more I think its a good idea , after thinking about it it makes perfect sence.....its a creeper with a built in safety roll cage to prevent getting crushed if the car did fall
a DECENT WELDER and some WELDING SKILLS, a short trip to the local metal supply store, a few quality casters, and a free weekend could result in a custom version magically appearing in your garage for under $200, but having a nice chrome /padded ,pro made version will look nicer
I just can,t tell you how often a decent welder comes in handy around the shop