Vehicle tracks has a variable configuration

VEHICLE BY INVENTION INCLUDES A BODY 1, A SERIES OF WHEEL ARRANGED FOR EACH SIDE OF THAT BODY AND HAVING WHEEL DRIVE 2 WHEEL AND SECONDARY 3 AUXILIARY WHEEL 5 MAY MOVE OVER AUDIT BODY IN UNPLAN WHICH ARE ARRANGED IN SUCH WHEEL DRIVE AND THAT SECONDARY WHEEL, A TRACK 6 EXTENDING AROUND SUCH WHEEL DRIVE, SECONDARY AND AUXILIARY ON EACH SIDE OF THAT BODY, AND A WAY TO MOVE THAT AUXILIARY WHEEL OVER AUDIT BODY IN SAID PLAN TO MODIFY THE CONFIGURATION OF THAT TRACK THROUGH WHAT IS OBTAINED REMARKABLE IMPROVEMENT OF QUALITIES OF CONDUCT AND MOBILITY VEHICLE.