Need a ski for measurements lol. I have a concept drawn up. Tubular steel contruction. Square tube slides in to you recover with a small extension off it to a round tube. The tube acts as a collar allowing another tube to slide over it. Second tube becomes a pivot point (after you pull a hitch pin out that connects the 2) attach a couple quick detach wheels and a pull out a testable handle and it would be a beach cart. Attach wheels , pull the pin , rotate the hualler down , pull out the handle and launch.
Push the cart in the water , float the ski on it , roll it back to the truck , slide the collar back in , install the second high pin , push in the handle and detach the wheels and your on your way again.