It sort of looks like a motorized dumpster body. Here, we use front end loaders, bobcats (a small version of front end loader), to basically scoop up debris and it's most times deposited into a large steel container we call a site dumpster. The dumpster in turn, is picked up by a roll-back transport truck. I have seen a somewhat scaled down version of your image which we called a motorized mule. It was a one man, walk-behind, motorized wheel barrow with dumpable bed and held about 1/2 a cubic yard of dirt.