Thanks for the Help Johnnywhip!
 

I contacted Ken McIntire as you suggested. He didn't have any 4000 lb lifts available, but he is going to look at the older used one I found and let me know if it is worth buying or not. He is a super nice guy and really seems to know his stuff. Thanks again. I'll let you know what he has to say. If it is a good lift, I am going to have him haul and install for me wherever we get a slip!