oh yeah i just saw the other concept
maybe to make it more distinct, it can be as big as a normal trashy (is that the singular form of trashies?) and maybe also have more gears so it looks like one of those cars you get from the dentists office
also, it can have an upgrade path based on pull back trains, where the melee attack is lowered but while charging it shoves along enemies with it, and the other upgrade path focuses more on the gearbox itself, doing the opposite of the train path and increases melee to be similar to the base shredder, just more cost and a charging attack instead of dying

