From Destinypedia, the Destiny wiki
The Cabal Plow is a class of Cabal vehicle, used for construction.
Cabal Plows are seen around ships and bases, usually when they are establishing a beachhead. They appear in two variants: small ones that clear away large rocks and rubble, roughly the size of a land Interceptor, or large bulking ones similar to the Imperial Land Tanks that clear and flatten large areas such as on Phobos.
List of appearances