Re: Removing boat from trailer
The ratchet strap and pipe affair is dangerous in many ways. Ratchet straps are not for lifting (including supporting lifted objects) no matter how much they're over-rated. It even says so right on 'em. And the pipes... oh the pipes. No fore-aft fall protection, save for the soil that the pipes are inserted in. Launching the boat onto rubber tires on the ground would be much safer. Chip.
Straps generally say something to the effect of "do not use for overhead lifting". This is more of a lawsuit deflection than a description of their capability.
The pipes would bend before the soil gave way.
It's dangerous in the fact that it requires common sense to set up correctly. If you are unskilled then you may think it's dangerous. I guess not everyone can be an engineer.
Oh, and by the way... if you research the winch they use in that portable boat lift you will find a warning directly from the manufacturer saying: "This brake winch is built for multi-purpose hauling and lifting operations. It is not to be used as a hoist for lifting, supporting or transporting people, or for loads over areas where people could be present". But I'm sure that boat lift is plenty safe. Imagine that.