The amount of drop on the receiver adapter influences the leverage the toad applies to trying to push the receiver up, or down. It's particularly important in a rapid deceleration. An 8 inch drop will be an 8" lever trying to pry the receiver from the frame, or bend the frame in a sudden deceleration. This was a common enough problem with the early Winnebago Views that had 3500 pound hitches that had that limit due to light gauge frame extensions a third party developed triangular braces to counter that leverage. The hitch on my View had deflected almost 10 degrees before I got those braces installed. No problems after install. I was pulling a 3500 pound Saturn wagon with a 4 inch drop hitch.