Were you thinking about the drive-up ramp type, or the kind you swing arms under? I chose the "drive-up ramp" type due to liability and not wanting our nose heavy trucks falling off! I then ordered the sliding ramp that slides front to back that can lift up on the vehicle's frame or axles. I think this is the best setup, since I have all the flexibility I need. More $$$to be sure, but do it once and do it right, if you can. I have no regrets.
Come to think of it, the kind I have is called 4 post, the arm type is called 2 post.