The Class III 2 inch receiver is needed for Weight-Distributing Hitch. The unit in fact is supposed to distribute the weight
to the center of the car when setup correctly. In most cases they fasten on sides at rear and the center 2” receiver ends about 8” forward. In this case the center 2 inch tube continues forward and follows the profile of the underside of car to be reattached. This design is due to the car being unibody reducing stress on the body.
Weight-Distributing Hitch systems are intended for heavy loads if vehicle can handle 200 lb. tongue weight
without a WD system on rear then it then can handle 400 tongue weight
with WD system when setup correctly; setting the vehicle limit.