Aspen’s crane dollies (Special Purpose Series) are specific use dollies and are designed specifically to assist mobile cranes to move within geographies that have specific regional weight regulations. Used primarily for on road, regular duty applications, these crane dollies have payloads of 40 tons with axle configurations of 4 or 5 axles (including truck axles). Aspen crane dollies feature low tare weight and have various frame and suspension configurations and have common air suspensions.