"It depends," and what you need the "support" to do.
What's the threat? What's the terrain? How good is your training? Do you have helicopters - which was what defeated the IRA's IED threat. A well trained foot patrol can stay out for days, being re-supplied either by caches or helicopter drops. Re-supply can even be "dropped" from "civilian vehicles."
Training, risk and competence solves 95% of the problem. It's not a "vehicle" issue. It's a competence issue.
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