2 piece construction for easy installation

Outboard air line connections to air bags for easier connections

Heavier gauge steel construction (3/8?)

Double 3/8" steel plates back to back between the air bags, no flex here!

Larger, more weight carrying air bags

Lower air pressure requirements (keeps operating pressures well under manufacturer recommendations.

More travel up and down for height adjustment mainly because of the design.

See more info and photos at  http://www.gmccoop.com/parts/mechanical-parts/quad-bag-system/