I have a '62 Bambi, and I know it weighs more than a 300D, around 3700 lbs., with water ans gas in the tanks. That alone makes it unsafe.

For safe towing you will need a 2 inch Reese type hitch, with sway control bars rated for the trailer and tow vehicle. Failiure to do so can cause an accident due to the trailer swaying left and right out of control. Don't believe me? Ask my dad, who in the early '70s learned the hard way towing another Bambi himself, without the sway control bars. They help distribute the weight of the trailer further forward along the frame of the tow vehicle.

You can do further investigations here: http://www.inlandrv.com/