I found this to be fairly easy on the Island map. Just use your starter C-255 truck with a short log carriage and short log trailer. And of course, Never switch to any other vehicle. This will be worth 6 points when you deliver the load. I I chose to start with the log station at the bottom (or far right depending on your philosophical bend) of the map. I then delivered to the lumber mill near the beach.
Get a second load of logs and head back for your second turn in, but disconnect the trailer before going in to drop the load. Reconnect your trailer and go to the other lumber mill and deliver that load. Then go and pick up a full load of lumber with the truck and trailer and deliver again.