I have a 1973 20' and that is a 20 for sure.
The rule of thumb is, to only tow 80% of the tow vehicles rating, and that includes passenger weight and cargo. You will want trailer brakes and a
contoller. The trailer can actually push you into jack knifing if the tow vehicle is stopping and the trailer isn't being stopped by brakes. Especially with a short wheel base tow vehicle ( like the Explorer ) Trailer brakes
take a lot of the strain of of the tow vehicles brakes. Possibly saving your rotors. A controller enables you to activate the trailer's brakes only, which can help you out of a sway situation. That being said, I would take it easy with that rig. No quick lane changes and give your self plenty of time, and room, to stop.