Yeah I'm not going to install the 3rd Erickson wheel chock on the rear wheel. I figure if I get rear wheel spin with the chocks on the front wheels only, adding that third one for the rear wheel will make it even worse. So I'm going to use heavy duty fold down D-rings for the rear wheel, they are rated at 4000 lbs. I also might add some anti skid tread on the deck where the rear wheel sits, if needed when I'm done. I still need to try and pull it out of the chocks with it in Economy mode to see if that helps. Either way, its solvable.
This is similar to the ones I'm going to use on the rear wheel.
https://i.postimg.cc/3xsy36HX/51-YX6...-AC-SL1300.jpg