They look like a pain to change from up position back to down position in the water. They will have to go deep into the water, requiring a deep reach in a small space.
Although they have support under the transom, I could see hitting a rock or something and them bending backwards, and out from under the transom.
I'd buy these instead...for three times as much. The larger wheels are what I used on my Zodiac as it was around 500lbs, and rolled across soft sand without issue.
https://wheeleez.com/wheeleez-boat-launching-wheels/