We purchased the receiver option from Oliver. The receiver from Oliver is a 2 inch receiver with an insert to make it 1 1/2”. When I got back to Oregon, I went to a local machine shop and had them remove the insert. Now our 2 inch bike rack fits perfectly.
Between the rack and both bikes, we are still under the 150 lb limit.
We have towed almost 7 K mile with this configuration and we have had no problems.
Good luck with your outfit.
Carl