Oh, for pity's sake!
Two favors please:
(1) Note that pestering Wyrmshadow is about as thoughtful as nagging Santa Claus.
(2) Maybe use some imagination and/or do a little research. It took me all of about ten minutes going through my (I'm guessing) two thousand or so unit D/Ls to discover the following:
(i) Jeffsheets made a M728 CEV dozer (@BadKharma: I think this is what you're looking for).
(ii) Although human, Rufus T Firefly made a modern human engineer.
(iii) Recon1591's Combat Engineer uses civilian vehicle animations (including a crane) for Fortress and Road building.
(iv) Smoking Mirror's "Digger" ("Mars Utility Vehicle") doesn't look unfathomably futuristic.
(v) A little more futuristic is Wyrm's own Centipede: although it has "only" a Settler animation, it entails containers being offloaded from a truck (hint: this is where the imagination part comes in).
(vi) Go futuristic: BeBro's SF "Workbee" will fly around and do all your jobs for you.
Etc.,
Oz