This vehicle was built on a simplified model year 1936 Ford V8 4x2 truck chassis, that was converted to 4x4 drive by Marmon-Herrington. Like its successor, the White built T5E1/M2 4.2 inch mortar carrier it also carried a 4.2-inch chemical mortar which was fired from the ground using a folding mount. A total of only six vehicles were completed, but they did undergo testing/trials at the Aberdeen Proving Ground.  The results of the trials found the vehicle to have excellent cross-country mobility, but was ultimately deemed too large and heavy when compared to the short range of the mortar (2,300 yards).

Review by Peter Brown via Missing Lynx