A cab without the doors and seat weighs about 300 lbs. My son and I lifted this one on the trailer last week just the two of us.
http://www.flickr.com/photos/advance-design_parts_co/12141662616/in/set-72157631870734114
This is how I moved mine during restoration.
http://www.flickr.com/photos/advance-design_parts_co/8129078346/in/set-72157631867396207