It's also a question of how much cargo can be carried and for what cost. It is possible to use helicopters to sustain combat units exclusively (it was done in Vietnam with the 1st Cavalry Division in 1965), but it requires a huge number of sorties and it's not practical in the long term. Some cargoes like fuel are simply easier to move via truck. There's also, as Uboat509 mentioned, the cost factor. It's much less expensive to run trucks than it is to get helicopters in the air. Doing solid airlift would also increase the logistics tail of the support element by a major amount.
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