Prepping and Storing your boat

Last year I was lucky enough to store my boat in heated garage for free. This year It will stay in a huge barn with a concrete floor. The building does not have the power hooked up. I was thinking of pulling all seat cushions, the carpet and maybe the amp rack. I was going to leave the rev 10s. I am going to winterize it and give it a good cleaning before I get it wrap up for the winter. Should I leave the tower up when they wrap it. it is not a far distance from where they will wrap it to where it will be stored ( 3 miles away and under 25mph when towing it) It will be out of the harsh weather that central Indiana has but it will still be cold in this building. Any other suggestions, comments regarding what to do besides a good detail, winterizing and wrapping it up?