When an off-road 4x4 vehicle is high-centered on rocks or bogged to the axles in deep mud, conventional bottle jacks lack the required stroke and ground clearance.
When an overland vehicle is bogged in deep mud, sand, or steep terrain, a single-line winch pull can quickly overheat the motor and drain vehicle batteries.
Towing with an unlevel trailer causes severe trailer sway, premature tire wear, and dangerous loss of steering control.