What is it replaced by?
From the article (though it doesn't say these still exist):
> But, she says, “Ivan could just make it through anything. I mean, he just floated across when the roads went bad,” as opposed to the Deltas and the 65-passenger Kress trailer, which often got bogged down in slushy snow and transitional terrain, and led to passengers being stranded out on the ice.
DVs (the Antarctic/naval term for VIPs) usually travel in minivans with oversize or tracked wheels. Those are also used to get smaller groups shuttled between places.