The Rhode Gear Co-Pilot is still available, but it no longer uses the "Rhode Gear" name. It does indeed use the Blackburn EXP 1 rack as its structural base. Ideally one can purchase a second rack at your LBS for a second bike so that a second bike in the family can use the same carrier. See:
http://www.amazon.com/CoPilot-Limo-B.../dp/B000G1YO2I