Gaining access to remote, muddy or sandy job sites can be a challenge. Differential locks, Central Tire Inflation System (CTIS) and all-wheel-drive provide solutions, but each technology comes with limitations and drawbacks.
CTIS works by lowering, the tire pressures, which results in a larger tire contact patch on the ground and therefore increased traction and flotation. "Some customers, [mostly working] in sandy soil, swear by CTIS" says Dave Hillman, vice president of vocational marketing, Navistar. "Those systems, when coupled with rear differential locks tend to be very functional."
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