I used 3 pieces of scrap wood, 4 bolts, a few screws, and 2 sets of old training wheel tires. The little car can be put under any of the four sides of the pen. It lifts the side just high enough to clear the grass and keep chickens and turkeys in. This pen is 8X10X3. I have heavy ropes attached to all four sides. It is very easy to grab the rope on the opposite side and pull the pen to its new position. It takes about 30 seconds for the whole process of moving a pen.