Looking for a hitch-mount for a friend that's not the T2 or similiar style. Reason being is that he wants to carry 4 bikes, and that gets pretty expensive using a T2. So far we're looking at the Yakima Kingpin and SlickROC, and the Thule Expressway. Anyone have these, or favor one over the other? Also, are the "security bells and whistles" on the SlickRoc worth the extra $ over the Kingpin? Any other suggestions he should consider?