Looking for some ideas. 1.What people use to weight down the back of the M20J ( or any other plane) to put it on the jacks in order to do some maintenance on the landing gear? How much weight does it take? How much up the jacks have to travel in order to lift the wheels off the ground. 2. Any tricks or anything I have to be aware of when changing tires? Thanks. BTW, I have bought EZ tow today for $200. Very happy.