Todd,
I believe your trailer is an Outback 328RL ?? If so, then it's a 38' ultralite trailer, built on a BAL Norco huck bolt frame. The distance from the rear axle to the rear of the frame is about 15'. That "vertical bounce" at the end of a 15' fulcrum could be 10 times the force of your 200 pound load on the receiver. That would likely do some pretty serious damage to the frame and to whatever you load on a rear rack, not to mention the risk to anyone following a tad too close behind you.....
Also, that frame system does not easily adapt to a rear hitch/receiver. Before you do any drilling or welding to the frame, I'd contact BAL/NORCO and discuss your plans as well as get their recommendations for how to best modify your trailer frame or potentially, learn that it simply isn't recommended by the people who build the frame..... You can contact them at 877-557-7788. The BAL website NORCO Frame information is located here:
https://balrvproducts.com/product/nxg-frame/
As sophisticated as the NGX frame is, I would stronly encourage you not to "wing it and hope it works"... The NGX frame is "built to be durable in its design envelope. It does not play well when used "outside its engineering capacity".... You don't want to be a "test case" for either their research or for their warranty repairs !!!!!