The issue on the table is road clearance, and there's no way you can accomplish that with only light wheeled vehicles. You're going to need something with the mass and the power to either push or plow through the vehicles clogging the roads, while providing the crews with protection against biters, Mallers and other hazards they might encounter in the process. Using heavy engineering equipment or armored combat vehicles you pay a penalty in fuel and support costs, but they have the ability to successfully complete the mission.
Humvees would probably be suitable for recon missions or convoy escort, but they are at a severe disadvantage in a stand up fight. They can't plow through massed crowds of zombies, any heavy weapons they carry are partially exposed and vulnerable, and if they ever get stopped and swarmed they don't pack enough armor to keep the biters from getting at their chewy centers.
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