A word on this: I have a Zodiac 310 RIB that weighs about 110 lbs. empty and 130 lbs. with a small tank, a pump, a couple of oars, etc. No engine. I had it on cast aluminum davits with three part purchases when we were motorsailing in Lake Ontario at about 6 knots. The base of one davit failed and snapped in two. I had to throw the engine into neutral and round up quickly to keep the loose arm...still attached to the heavily angled Zodiac...from fouling the prop or rudder.
Long story short, we got the wife in the Zodiac, got the Zodiac alongside and emptied, and then hauled it via the painter and a spare halyard aboard.
From now on, it's either towed on a bridle or lashed on deck. My plans for a windvane more or less preclude davits anyway, and I want the welded on pads the davits were bolted to for things like Solar Stiks, don't I?