Yeeeeaaaaah.....about those sandbags. They did little to stop any German tank shell but provided the front crew protection from other fragment projectiles including Panzerfaust and near shells exploding in front of the tanks - sandbags were also used inside on the floors of the M-8's by the front crew for protection against anti-tank mines.[1]
Let's face it, the M-8 did nothing to protect the crew against any enemy tank, but provided excellent protection against infantry units and because of their speed to probe and recon enemy lines.
Livesey, Jack (2007). Armoured Fighting Vehicles of World Wars I and II. Southwater. p. 71. ISBN 978-1-84476-370-2.