underslung

adjective

1. suspended from an upper support, as the chassis of a vehicle from the axles.
2. supported from above; placed or suspended below the source of support: Conestoga wagons with underslung bundles and kettles.
3. more massive at the bottom than the top; squat: The high wings and large fuselage give the plane an underslung look.

adjective

1. suspended below a supporting member, esp (of a motor vehicle chassis) suspended below the axles
2. having a low centre of gravity