Combat Engineer vehicles or extending through to cranes for example, should give PCs more ability to "rebuild" the world (ie fixing things). So i think these vehicles could re-focus the game away from combat and more into "moving forward".
Defending such a vehicle, or whatever project it was working on (such as a bridge or armour shop), should open up enough possibilities for action. Or sourcing building materials from nearby (or not so near by!) should provide little story arcs to base around PCs using CEVs.
I've never had PCs use them. But have considered having NPCs use them (ie PCs pass by them).
I hear what your saying about them being a "twiner" vehicle.
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