The secret is thickness. Anything less than 3/4" is probably a waste. I tried the pluwood once, with 5/8" sheets and my old M-610 Bobcat. Every time I turned the plywood slid around and grass was exposed between the gaps. The rough surface of the plywood scraped grass off and some was dug out by plywood corners. When I loaded the tree on the Bobcat the plywood started crushing and breaking apart. With thin plywood it's helpful to heap dirt or sand on it so your tires aren't trying to tear it apart. My protective material of choice is a 10' by 10' by 1/2" rubber conveyor section that I lay on the lawn at the turning zone. I put bald tires on the loader and squirt soap all over. Even when lifting a full load it turns as smooth as can be. Also before setting all this up why not get yourself a set of 16 inch wide tires and rims that someone wore out. The smoother and wider the tire, the less digging your loader will do in a turn. Even if you scrape off the grass, if the roots are intact they will regrow grass in two weeks and you will never know the loader was there.