To increase stability and capacity on a crawler crane, which of the following methods is recommended?

Blocking under the toe of the track is a recommended method for increasing stability and capacity on a crawler crane because it effectively enhances the crane's base of support. By using blocking, you help to distribute the load more evenly and reduce the risk of tipping or instability. This method allows the crawler crane to operate on softer or uneven ground by providing additional support directly beneath the tracks, thereby increasing ground bearing pressure and improving overall lifting capabilities.

This technique is particularly valuable when working in environments where the soil conditions may not support the full weight and load of the crane. Proper blocking can also be a quick and cost-effective solution to enhance stability without needing to mobilize larger equipment.