Good advice here, Tony -- If it isn't already a moot point, please check out the
Trailering Article in the Tech Tips.
Personally, after a very bad experience with a tow dolly (that *almost* ended up with the complete destruction of my '70 Chevelle SS convertible), I switched to a tow vehicle and a trailer to haul my trucks/projects/etc around -- I currently tow with a 25-foot gooseneck pulled by a Dodge Cummins 3500 dually.
Congrats on your new project!
John