Originally Posted by sheim911rs
I just got a hitch extender....they come in different lengths
Do not run a hitch extender with a 4 bike rack. If you place bikes on the furthest racks it can cause problems as the weight has too much leverage on the hitch. Usually this is spelled out in the manufacturer's recommendations.
My recommendation for a hitch rack would be a Thule or Kuat rack. Anything that holds the bike by the wheels. It is not good to leave them dangling behind your car. Also if you are rear ended, your bikes are hosed! The rubber straps on the top tube will also scratch you bike's paint job.
With most wheel mount racks, you can not use the folding feature due to clearance with the spare. Fortunately hitch racks are very easy to take off and on.