Rolly Kid Caterpillar Truck Specification.. This caterpillar truck has adjustable seat. For ages 2 1/2 plus. The following are not included with this item - Winch (40/928/0), Logs (40/963/1), Cat Trailer (12/203/5) and Rear Excavator, can be purchased separately. Mechanical features include a strong 12mm thick rear axle, covered integral fixed wheel chain drive, a pedal crank with eccentric bearing chain tensioning system and anti slip pedals,and a heavy duty front axle with suspension.