I added a 2’x5’ cargo rack to the rear of our camper. It is attached to the top of the frame between the bumper and the camper. It weighed in at 35 pounds or so. I had a tongue scale set up and put 100 pounds on the rack (2 grandsons). The tongue weight went down only 25 pounds. I put a bike, spare tire, 6’ aluminum ladder, patio mat and sewer tote on it. I weighed each one and the total came out to just over 100 pounds.
It’s been about 4 years now and still works well. I have never experienced any sway, with our previous Frontier or the present Silverado. With the small amount of unloading, tongue weight is between 12% and 14%, depending on loading.
And, GASP!, it’s on a Lippert frame.