Agree with loosing the tracks but best is removing them. I think if you jack the machine up with the tracks on gravity will create two stretch points, at the front and rear. Probably the best would be jacking just enough to take pressure off but leave the track supported by the ground. Sunlight still seems to be the rubber killer. Think of car tires. Sun exposer causes dry rot and checking. I've had tracks where the outer belting has shrunk in the sunlight and causes constant correction in steering when operating the machine. Track belts are also similar to car tires in that you just have to plan on replacing them after awhile.