I bought one of those to keep on board and it is fairly handy BUT one major failing.Not sure any of these are suitable for “off-road” use, but we have one of these on board which has been very useful Yaheetech Heavy Duty Aluminium 80kg Folding Foldable Hand Sack Truck BarrowCart Trolley Industrial Warehouse Hand Truck, Sack Truck: Amazon.co.uk: DIY & Tools
Ive got something like that that I purchased at Earls Court BS many years ago. I fold the wheels out and the load platform then locks the wheels in place. It needs some tlc as the handle is steel and on the boat .....Looking for a folding, truck with off-road capable wheels, <6kg with a 50kg capacity. Screwfix do this but wonder if there are other suggestions.