I bought the Harbor Freight dolly for my FJR 1300 and I am using it now for my F6B. It works but is it not quite long enough and it can be a pain setting and unsetting the locks. I am going to go with the Black Widow pro. It has better wheels and locks on the wheels instead of the pins. Will keep everyone posted.
As promised. I bought the Black Widow Pro from Discount Ramps. It took about an hour putting it together and it is much easier to load the F6B and move it around than the Harbor Freight model. It is wide and longer and it is a perfect fit for me. Big wheels make it easy to move.