You might be out of luck on this one. I did find base plates for my LX470, but since your car is even MORE untowable, I doubt that anyone has a production base plate for it. You might be able to get someone to do up a custom one for you, but then you've got the issue of towing an auto tranny car. Are you going to use a driveshaft disconnect?
2014 Newmar Essex 4544
2007 Lexus LX470 Toad