This device is used to support and adjust the main landing gear replacements of certain wide-body aircraft. Its modular design offers a compact structure, simple assembly and disassembly, and convenient travel, towing, and transport. It features left-right and fore-and-aft movement, rotation around its center, and lift and pitch functions. Ground travel and alignment are powered by its own power source, which can be powered by batteries or an external power source. It is suitable for field operations in the field.