We used to use similar inflatable rollers @300mm OD to pull a 4M Flatacraft up and down a beach without damaging the Hull.
They are very effective, reduce the effort considerably, and obviously keep the hull in better shape on a gravel beach.
Team work and a steady pace is required to ensure whoever is collecting the rollers out the Stern and putting them under the Bow isn’t overtaken.
But, beware underestimating how much effort will be required to move it up any sort of slope, and importantly keep it from rolling backwards if progress stops for any reason.
Nasher.
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