Chassis cabs carry the highest average complete monthly cost of any category CarCostCX tracks, $2,033 a month, reflecting their role as heavy-duty commercial platforms. The 2026 Chevrolet Silverado 3500 Chassis Cab Work Truck leads the category at $1,442 a month, 29.1% below the segment average. At $49,098, the Silverado 3500's loan payment runs $993 a month. Insurance adds $143 a month, fuel comes to $186, maintenance adds $70, and title and registration add $50. The GMC Sierra 3500 Chassis Cab Pro followed at $1,505 a month, and the RAM 3500 Chassis Cab Tradesman placed third at $1,640. For fleet buyers and contractors specifying upfit work on a chassis cab platform, the base vehicle's complete monthly cost is only the starting point, but the gap between the value leader and the segment average is significant enough to matter across a multi-vehicle purchase.

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