The other aspect to hanging a dinghy
from davits is that some way of preventing it from swinging from side to side is necessary. Some members have mentioned ratcheting straps: I've found that a truckies hitch works ok but I've only a light dinghy. The side straps could be arranged so that they carry some of the down force as well.
If you can have your davits constructed so they can carry a heavy load that's better. From memory I went for a 400 kg load on Boracay, but 500 would have been better. I've had to crawl across the back of the dinghy a couple of times for whatever reason while it was on the davits and allowing a rear load of 25kg (dingy) + 25 kg (outboard) + 15 kg (fuel) + 100! (maximum me) to give a total of 165kg. Make that a 3:1 safety
margin and we've a load of pretty close to half a tonne on the rear mounts only.
When the seas are high and/or the rain is p!$$!#@ down its nice to have a bit of a safety
The other little discussed aspect of davits is how to actually lift
the dinghy. I initially brought some small but expensive double blocks but the rope
just jammed in them under the load. I took them off and put in a couple of small manual boat trailer winches, with the rear one having double ropes. Works fine.
From memory the bottom of Boracay's dinghy sits about a foot above deck