Vehicle Side-Grades and Specialisation

Some of this is kind-of already coming with the Update 4 amphibious vehicles, but I think it would bring a good bit of depth to the vehicle mechanics to introduce various more specialised side-grades for vehicles, sacrificing flexibility for better capabilities in a specific task

Some examples being, wheel loaders which could move a faster than excavators but pick up less material (or mine slower in general) for smaller terraforming projects, or log cutter/forwarders which combine a tree harvester and truck into one vehicle at the cost of speed and being only useful with intermediate storage (because of said speed), or an additional truck type for low-volume deliveries at a faster speed than even a pickup can do

Additionally some could be less side-grades and more just standalone specialised vehicles, like an underground pipe layer for those who really like underground pipes, etc.