For the cost of doing it safely, you could buy one of those fancy dollies.
The biggest issue is you have 7-10% of the weight on front hitch. If you just weld a hitch to the back, it's going to constantly be trying to pop off the ball.
To do it safely, it could be done. Custom weld a receiver hitch to the frame (not the rear bumper). Include a large heavy duty rack (suitable for a 1000lbs or more). Make sure it is way over strength and custom weld a hitch (not the ball) to some square stock to fit in the receiver). Add another jack to the rear. When you go to hitch up, you would drop the rear jack just until it touches ground and then lift the front jack. Then you would stack weights on the platform until the rear hitch jack has at least a little weight on it. Then you should be able to safely hitch up and move the trailer (this likely wouldn't be suitable for on road use). All told, this seems like it would be expensive and a hassle.
