What to inspect before towing heavy loads in Michigan
At Garrett Auto, we help Michigan drivers prepare their vehicles for towing safely and confidently. This guide explains the key inspections and adjustments you should make before heading out — whether you're towing a boat to Lake Michigan, hauling farm equipment in rural counties, or pulling a camper up to the U.P.
Start with the basics: confirm weights and legal limits
Before any trip, know two numbers: your vehicle’s maximum towing capacity and the trailer’s loaded weight. These are the foundation of safe towing. If you’re unsure, check your owner’s manual or the load plate on the trailer. Staying within capacity is especially important on Michigan routes that include steep grades, narrow two-lane roads, and frequent stop-and-go traffic where extra weight increases braking distance and transmission strain.
Hitch, coupler, and tongue weight — the physical connection
Inspect the hitch and coupler for rust, cracks, or loose fasteners. Make sure the hitch ball and coupler are the correct size and that the coupler latches and is secured with a locking pin. Check tongue weight: a general rule is roughly 10–15% of the trailer’s gross weight should rest on the tongue. Too light creates sway; too heavy overloads the rear axle and steering.
Brakes and brake control — critical for safety
Trailer brakes and a properly set brake controller drastically improve stopping distances. Inspect trailer brake pads/shoes, adjust if necessary, and test the electric breakaway switch. For older trailers, make sure hydraulic or surge brakes function smoothly. Michigan winter and salt exposure can accelerate corrosion, so inspect brake lines and fittings for leaks or rust before long hauls.
Tires, bearings, and suspension checks
Check tire pressure and tread on both tow vehicle and trailer — recommended pressures are often higher for trailers and need to match the load you’re carrying. Inspect tire sidewalls for cuts or dry rot. Repack or inspect wheel bearings as recommended; overheated bearings are a common cause of roadside failures when towing. On the tow vehicle, confirm suspension components and shocks are in good shape so handling isn’t compromised under load.
Electrical, lights, and wiring
Test all lights: brake lights, turn signals, taillights, and clearance lights. Look for corroded connectors, brittle wiring, or loose grounds — Michigan salt and humidity accelerate electrical corrosion. Carry a spare trailer bulb kit, a set of basic connectors, and electrical grease for quick roadside repairs.
Cooling system and drivetrain readiness
Towing puts more heat into engines and transmissions. Inspect coolant level and condition, radiator hoses, and the transmission fluid level (if accessible). Make sure your cooling fan works and consider carrying a transmission-temperature monitor for long, hilly routes. If you tow frequently in Michigan — think summertime heat across I-96 or long climbs toward the U.P. — an extra cooling check can prevent costly overheating events.
- Confirm gross trailer weight and tongue weight
- Secure hitch pin and safety chains crossed under the coupler
- Test trailer brakes and vehicle brake controller
- Check tire pressures, spare tire, and wheel bearings
- Verify lights and wiring connections
- Top off engine/transmission/coolant fluids and inspect for leaks
- Pack emergency kit: tow straps, reflective triangles, basic tools
Loading and securing cargo — real-world tips
Distribute cargo so the trailer sits level fore-to-aft. Keep heavy items low and centered between the axles. Use ratchet straps or properly rated chains and check them frequently during stops. Michigan’s varied roads — from Detroit traffic to gravel county lanes — can shift unsecured loads quickly; a mid-trip check at rest areas or gas stops can save a towing disaster later.
Practice drives and route planning
Do a short practice drive near home to confirm handling, braking, and that there’s no visible smoke or odd noises. On longer trips, plan routes that avoid narrow, winding roads if possible and identify safe pull-off locations. When towing through winter, allow more stopping distance for icy patches and watch for plowed shoulders and packed snow that can alter lane width.
Real Michigan examples
Example 1 — A family towing a small boat to a western Michigan launch found the trailer lights intermittent; a corroded ground at the connector was the culprit. A quick cleaning and dielectric grease fixed the issue before they reached the ramp.
Example 2 — A Grand Rapids resident towing a landscaping trailer overloaded the back of their vehicle. The rear sagged, steering felt vague, and the trailer began swaying on the highway. Redistributing the load and moving some weight forward cured the sway and made the trip safe.
When to get professional help
If you spot worn suspension parts, suspect bearing wear, see coolant leaks, or your brake controller won’t calibrate properly, bring the vehicle and trailer to a shop. Garrett Auto offers pre-tow inspections and can advise on towing setups, brake adjustments, and any necessary repairs — a short service appointment can prevent long delays on the highway.
How often should I inspect bearings on a trailer used year-round in Michigan? For frequent or heavy towing, inspect wheel bearings every season and repack them as recommended, especially after a lot of exposure to salt or water crossings.
Is extra cooling necessary for older vehicles when towing? Older cooling systems can struggle under sustained towing loads. A professional inspection of coolant condition, thermostat, and fan operation is a good precaution before long summer hauls or steep northern Michigan drives.
