I've sold random sized piles of wood before, usually in truckload sized quantities.
I'm a member of a few Facebook Buy/Sell/Trade groups. I take a picture of that exact load and write something to the effect of "$50, cash only, delivered today, first come first serve"
I've never had to sit on a load for more than an hour, and usually get a few orders for loads while I'm at it. I also learned that my dually holds almost exactly double the wood as my Ranger, but I have better luck selling 2 Ranger loads. People seem to think a $40 Ranger load is cheap, but a $80 truck is too expensive. Even though the 'price per piece' is as close to the same as I can get it.