I would also add Aquapro to Cam's list. The RIB's now have an aluminum hull which work fine.
Here is an interesting way to keep the RIB on davits, upside down. The guy had the fittings welded onto the bottom of the aluminum hull. Apparently the only problem is when dragging up the beach the fittings sometimes snag seaweed and other crap.
YouTube - The drogue saves the day