With Motorized Trailer Landing-Gear Lift Systems, the hand crank is relegated to back-up status. Bolted to the trailer's frame, they're powered by lithium-ion battery, electronics, or compressed air (via the rig's emergency braking system). These push-button or digital device-activated units will reportedly raise/lower a 70,000-pound trailer in under a minute. All reportedly operate well in both high and low temperature extremes.