It s not hard to damage an aircraft tire, wheel brake assembly, hydraulic lines, landing gear door, or any other pact of an aircraft if you re not careful and ram it with a jack. Movement of jacks aboard ship when there is any pitch or roll of the deck is extremely hazardous. Even with a calm sea, a smart turn into the wind by the ship while you re moving an airframe jack can be disastrous. Transportation of jacks over longer distances ashore, such as from the SE pool to a hangar on the other side of the field, can be a real problem. If any other type trailer, truck, or flatbed is used, you must have sufficient manpower available to safely get the jacks on and off the vehicle.
Jacks are heavy and cumbersome to handle.
Loading and unloading is hazardous even when you have enough people. Usually, a locally fabricated sling and some sort of hoist is necessary. Forklifts should never be used to handle or lift jacks. The tripod cross braces are not strong enough, and you will damage the jack. The chances of dropping it are also high.