Convertible Tops for Open Cab L Model Fire trucks query in Antique and Classic Mack Trucks General Discussion Posted Wednesday at 01:58 PM I think it could be done. Maybe out of 1” tubing, or a little heavier. Of you were to build a framework that could be covered. You could take it to a canvas shop and have the make you a nice fitting top that could be removable. Kind of like a military vehicle. Here’s a few pics of a military pickup I have and the bow system For the cargo bed and cab top. Just food for thought.