If your vehicle currently has a 2" diameter hitch tube but you need a 1-1/4" opening, as well as additional clearance for your hitch-mounted accessory, here's an adapter that does the trick. This receiver hitch extension converts a Class III or IV receiver tube to a Class II and extends it an additional 4". The adapter has a 3,500 lb capacity and is made of durable steel.
Converts and extends a receiver tube from 2" to 1-1/4" with a 3,500 lb capacity, durable black powder coat finish and all steel construction.
4" Receiver Hitch Extension Tube for 2" Receivers ( Model# 45770 )
Constructed of durable steel with a black powder-coated finish, this receiver hitch extension converts the receiver tube sizes from 2" diameter hole (class III and IV) to a 1-1/4" (class II) and extends to 4" with a 3,500 lb Capacity.