I don't carry 230 pounds on the back of mine, but when I do attach the cage, the difference on the tongue is nil
My receiver hitch came factory installed, but it's the small receiver. I use the 2 inch receiver that wraps around your trailer bumper as it's supported and welded together with the supports for the factory hitch.
One thing that did need to be modified and I found an easy fix for. When the cage was just inserted into the receiver hitch, there was a LOT of side-to-side (up and down) wobble. If traveling down the road, the thing would have rocked back and forth and probably ended up breaking all the welds. The bumper and hitch combination were strong enough to support the weight of the cargo cage, but that rocking would have been a disaster. The rocking was possible because of the slack space from the cage shaft that inserts into the receiver and the receiver walls.
My solution was to run a support from each side of the cage that would simply catch the top of the bumper. I kept shaving down one board until I got the thickness just right. It fit snug on top of the bumper (both side) and now it cannot rock. It does take 2 people to attach it, I made it pretty snug so there was be no rocking. I also used wood instead of metal so it would not scar up the bumper paint, and (if there was ever a need), the wood would break if stress to much before the bumper broke. Anyway, the design worked. I've towed with this cage and contents now for many thousands of miles and the bumper and hitch framing is still solid.
But to answer your question, I think you'll find the difference on the tongue weight to be very slight with just 230 pounds on the back. But do find a way to keep the thing from rocking. And remember, the wider the cage is, the more weight extends farther out, causing more stress on the receiver. Any bouncing or any movement of the cage will wear and tear at your weld joints.(or around the joints, or the weakest spot in your frame).
