I had 4 mako shark saddles on my post WWll 1/4 ton Bantam trailer for my 14' PA but added another 2 mako shark saddles for a total of six after I was getting dents in the hull from the saddles, even after added two more saddles I was still getting dents so I took all the saddles off and used 4" black ABS pipe. I store the PA on the trailer in a closed storage facility that gets hot during the summer. Eventually all the dents have gone away from the hot weather since I changed to the 4" pipe cradles.
When the PA is in storage the tie downs are removed and the PA is just resting on the 4" pipes (I did the same when I used the Mako saddles). I also had problems with the Mako saddles collapsing because of the PA's weight and the pressure of the tie down straps. I contacted Yakima and they said they PA's are too heavy for the Mako saddles even though there were no weight limits on the packaging anywhere. I also had problems with the Mako saddles sliding out from under the PA leaving the hull resting on the cross pipes, I added thick foam under the hull so the hull would not make contact with cross pipes. In my opinion the Mako shark saddles are not suitable for the PA's. I used 4" pipe so I could get my hand inside the pipe to tighten the U bolts used to hold the pipe in place and also because it gets the hull up and away from the cross pipes. I have had the pipes on for a year or two and no problems even with towing the trailer down rough 4x4 roads.