I would just order the Putnam XDR. I had the same problem when I bought my 12,000 gvw equipment trailer. The factory receiver is only rated at 5,000 without w/d. Stupid but all the manufacturers do it. I like the XDR better anyway, for one thing the receiver tube is below the cross tube instead of going through it. This means all but the tube tucks behind the bumper instead of hanging below it like the stocker. One thing to think about is I was not able to find a ball mount within a 100 mile radius of my house in Northern California that was rated for more than 8,000 ponds and only found 1 ball good for 12,000. I ended up placing a second order to Southwest Wheel for the ball mount. If I where doing it again I would just order the whole mess from Southwest. This hitch is great. I had to have my truck pulled backwards from the mud and snow next to my house and the ball mount hit the edge of the pavement stopping both trucks and bent the ball mount about 5 degrees just below the receiver and the XDR is fine, no damage at all. One more thing after installation the center of the receiver is within 1/4 inch of the factory height.
Walt