I haven't read through all post but I have been satisfied with the four post I got (cheapest that I could find). I did get the castors and extra jack pan. I had to be able to move it around and couldn't use a 2 post. I use it on almost everything I've got (C3500 truck is too wide) including my Suburban. It is very stable. Other points: 1. Being movable, I even moved it outside and lifted the Suburban to pressurewash the underside. 2. To change tires, brakes, etc..., lift a few feet, put jack stands under car frame, let lift down and then place second set of stands on ramps to car frame and then lift again. I usually work it up one end at the time but wind up all 4 wheels off the ground (and ramps) and the car with axles at eye level. I know it sounds crazy but its easier than fooling with jacks and actually safer (more stable)