You didn't mention what type of tractor you are shipping. It will cost extra to have the load tarped. That might be important to you if it has a cab, new paint, valuable accessories, etc. If it has a cab, ask about glass breakage coverage.
Canopy?? It might not do so well at 75MPH on the interstate.
It will most likely be chained down on an open flatbed truck with possibly lumber or other freight, open and exposed to high winds, weather and items kicked up off the road by other vehicles.
You will also have to plan on taking it to their terminal so they can drive it up onto their flatbed. How will you get it home at the other end from the destination terminal?
Lots of things to consider.