I watched a load of clips on YouTube where boats being craned out of the water go wrong - so watching my own was an anxious moment.
But these guys do it for a living and were competent. He's also a family friend of my wife and the Corsican Mafia code means he has an obligation to look after the boat well
The solid bars above the straps seem to hold the straps out quite a bit from the tubes, so I reckon they are not under too much stress.
It was in the air for about 2 mins tops.
The slipway looks nice, but the bit that's underwater slopes down at 45 degrees, that's way too steep a change for a twin axle trailer. It was a nightmare putting the boat in the water using the slipway. As soon as the rear axle drops over the edge the front of the trailer wants to lift up into the air - which put the van in danger of lifting its wheels off the ground.
I mentioned it to the guy looking after my boat and he said they don't use the slipway as its a daft design. Fine for small boats, but crap for larger ones or anyone with a twin axle trailer.