I have never had to move a boat over land before, so I am curious - what are the issues, costs, etc, associated with moving a boat over land. No specific boat, but assume 30'ish in length, heavy. What is the upper limit on size ? There must be some limit for travel on the interstate highways, etc, are you approaching it in the 30 to 40 foot range ? What are the primary factors that determine cost ? Thank you for any help.