[razerwire]

Have Mohawk 9000 since 2004. It's a well made unit and have had zero problems. Big rollers like the mast on a forklift. Make sure you use the correct grade of bolts or Allthread if you supply your own, like in used unit, or you might have problems. Seen the results when correct bolts were used to mount crane to truck but low grade nuts were used. Nut threads pulled out like butter, it was not pretty. Manufacture would like 6" of concrete and new units have bolts that come with lift along with shims. Most areas have installers and service people who can be a resource for used unit, or install unit for you. Local company in my area had several used units Got to know them when they installed my lift. Mohawk has 5 year warranty if that is important to you.