Why mixed fleets need a different approach in Michigan
Light trucks (service vans, pickups) and heavy trucks (box trucks, dump trucks) share garage space but face different stresses. In Michigan, winter salt, spring potholes, and frequent short runs around towns like Grand Rapids or Ann Arbor all affect components differently. An efficient maintenance plan recognizes those differences while creating overlap where inspections and service can be combined for savings.
Core challenges: what to watch for
- Tires & alignment: Heavy trucks carry higher axle loads and show sidewall fatigue sooner; light trucks are more sensitive to alignment from everyday curb impacts and potholes.
- Brake systems: Heavy brake wear from loaded city deliveries and repeated stops; light trucks often see brake glazing from short-trip driving.
- Suspension & steering: Heavier suspensions may hide worn bushings that create long-term frame stress; light trucks reveal worn shocks sooner, affecting ride and cargo security.
- Corrosion: Road salt accelerates underbody and brake-component corrosion, especially where splash and spray are heavy — think lakeshore routes and highway shoulders.
A scheduling framework that works
Start with a baseline inspection schedule for each vehicle class, then layer on mileage- and season-based checks. Example framework:
- Daily: driver walk-around — lights, tires, visible leaks, and secure loads.
- Weekly: fluid checks, tire pressures, and quick brake/air-test for heavy trucks.
- Monthly: inspect brakes, suspension, battery terminals, and underbody for salt damage.
- Pre-winter and pre-spring: full service including heater/defroster checks, cooling system, and undercarriage cleaning.
Parts, inventory, and vendor planning
Maintain an inventory of wearable parts that overlap across classes — filters, brake pads in common sizes, bulbs, and belts. For heavier items like air brake components or heavy-load tires, keep a prioritized reorder list. Garrett Auto helps Michigan fleets identify the right balance between on-hand spares and just-in-time orders to avoid both downtime and overstock.
- Standardize inspection forms so techs can rotate between light and heavy trucks.
- Log all rust-sensitive areas with photos during spring service.
- Schedule axle, U-joint, and bearing inspections after winter and heavy hauling seasons.
Michigan seasonal priorities
Winter: prioritize cold-start reliability, battery capacity, heater performance, and brake responsiveness on salted roads. Spring: focus on underbody corrosion, wheel alignment, and suspension damage from potholes. Summer and fall: cooling system checks and ensuring air-conditioning/heavy-duty fans operate correctly during long hauls or heavy loads.
On-the-ground examples from Michigan fleets
Example 1 — A Lansing landscaping business ran light pickups and a larger dump truck. After repeated spring pothole seasons, the dump truck developed a bent axle seal and the pickups began showing uneven tire wear. By scheduling alignment and bearing inspections for both vehicle types together, the owner reduced repeat shop visits and caught a damaged wheel bearing early on the dump truck.
Example 2 — A UP-based delivery operator had mixed duty cycles: light trucks for last-mile deliveries and a heavy box truck for regional moves. Pre-winter inspections that included underbody salt cleaning and brake system lubrication cut winter roadside calls by half the following season.
Practical inspection and maintenance tips
- Use torque-checked lug nuts and record torque values after any wheel service — Michigan's temperature swings can loosen stressed fasteners.
- For heavy trucks, prioritize air-system drainage and filter replacement; moisture-free air reduces valve and brake chamber failures.
- Document fluid top-ups and filter changes in a shared fleet log — this simple habit speeds diagnostic work when symptoms appear.
- Encourage drivers to note unusual sounds or handling changes immediately; frontline reports often catch problems before they escalate in Michigan's demanding seasons.
FAQ — How often should I clean undercarriage salt off fleet vehicles? After prolonged salt exposure (several times during winter storms) and definitely once in spring. Removing salt reduces corrosion and lengthens service life of brake and suspension parts.
