>With the JLTV costing the expensive side of $400K per unit, it makes sense to have a cheap utility vehicle for rear echelon duties, so would a militarised Jeep Wrangler fit the bill?
Crew cab truck.
It can do off road, it can do on road. It's faster and more fuel efficient compared to a jeep. And actual tooling and spare parts exist in abundance.
It can carry five crew in the cab and additional six in the back. In lieu of six extra crewmembers, it can carry outsize loads in the back, such as wounded or heavier weapons, or supplies for the five crew.