You can load it pretty heavy. For the drawbar it is the rear axle rating that matters. In my 2120 manual (bigger brother of the 1920), the rear axle capacity is stated. Also lock the swing, swinging drawbars are not intended for this type of trailer. I routinely haul my 10,000 pound 2 axle tractor trailer around with my 2120 or TN. Load it evenly and try not to take too sharp corners. It behaves funny when you cut it very sharp as the wheels have to slid sideways to make the corner. Backing out of that almost jacknived position is a bear.
Andy