I looked at a scamp 5th wheel years ago and it wasn't a ball couple but a regular pin and plate like I have for my 31ft holiday rambler 5th wheel.
Trouble was my 3/4 ton Silverado's bed was too high to get under the camper so I didn't buy it.
John is your a goose neck or pin & plate?
Just looking at Dennis's pictures the hitch assembly is over the
axle, which is where it should be, but it looks real close to the cab of the truck.