Review on KAC Overdrive 2" Hi-Low Hitch Adapter (Non-Towing) - Heavy-Duty, Patented Anti-Wobble Mechanism, Drop or Riser by Dan Phillips

Possibly the most epic product I've found on Revain. My application didn't allow me to use any anti-rumble devices on the hitch due to gap issues. The built in anti-rattle feature is amazing. If you bought this type of adapter, the inserts on all of them are solid, so you can't use an anti-rattle pin in them. I used this to install a bike rack on the back of a custom camper trailer with very limited clearance due to the front door being very close to the hitch receiver.