Had the 2 post and now have the 4 post. The problem with the 2 post in my situation was that I had a number of vehicles that I wanted to put onto the hoist ('32 Ford, '40 Chev, '42 Ford COE, '37 Pontiac) and I had trouble with every one of them. The 2 post arms have to be placed onto the frame and the wheelbase on a '32 is definately shorter than the rest in that the frame comes up in a sweeping motion. Try to have the front arms come and hit the frame the same time that the back did!! It was virtually impossible without using blocks to fill the void at the front. The '40 had the same problem in that the exhaust ran beneath the frame rail and so there was no room for the arms. The COE had a fairly straight frame, but because the COE has virtually no snout, you had to make sure it was far enough forward or back depending on where most of the weight was. Much of the time was spent making sure that the arms had to be in the proper position and that the vehicle had to be centered in the footprint of the hoist. That's why I sold the 2 post and got a Bend Pak. Now, no matter what I drive on it, as long as the wheels are on the ramps, the car goes up with no worries. My hoist is bolted down because I cannot see a person swinging the hoist out of the way and then bringing it back into its position. The posts have to be plumb in all directions and according to the instructions you have to adjust the locks so that they activate the same time. I've been trying to make my locks activate together and I still have a delay or can hear two of them activate within a sec of the other two. No biggee as it works great. Disadvantage of the 4 poster is that it occupies space and no matter where you put it or move it, it will still occupy space. That's why I bolt it down; being a little cautious as I know it's not going to move. Incidentally the '32 slipped off one of the arms on the 2 poster but stopped short because of the running board holding it up there. That's when I decided I had enough.