How much should I charge for a mobile DOT annual inspection?

Typical mobile pricing is $85 to $175 per tractor or straight truck and $60 to $120 per trailer. For volume fleet visits of 10 or more units at one location, drop to $65 to $110 per unit because your travel amortizes across the yard. Price the inspection to get in the door; the real profit is in the brake, light, and air-system corrections the inspection uncovers, billed separately at your labor rate.

What hourly rate should a mobile diesel mechanic charge?

Mobile diesel realistically bills $125 to $185 per hour, above a stationary shop's $110 to $150, because you are absorbing drive time, a fully stocked service truck, and the convenience of coming to the customer's yard. Build the rate from your true costs (labor, truck, fuel, tools, insurance) targeting 60 to 70 percent gross margin on wrench time, and add travel as a separate trip charge or portal-to-portal line.

How do fleet maintenance retainer contracts work?

You charge a fixed monthly fee per truck, commonly $75 to $200, that bundles the annual DOT inspection, scheduled preventive maintenance, and priority response. Breakdown repairs are billed on top. A 20-truck fleet at $125 per month is $30,000 a year of predictable contracted revenue before any repair work, and it locks out competitors while giving you scheduling visibility to route efficiently.

What does a diesel A/B/C preventive maintenance service include and cost?

An A service (oil, filter, lube, quick inspection) runs about $250 to $450 mobile, driven by diesel oil capacity of 30 to 46+ quarts. A B service adds fuel and air filters and a DEF check, roughly $450 to $750. A C service adds transmission, differential, and coolant work at $800 to $1,500 or more. Price each tier as a package and mark up consumables 25 to 40 percent.

Why is the FMCSA 396.17 documentation so important to price for?

Because the record must be retained, reproducible, and signed by a qualified inspector to survive a roadside inspection or FMCSA compliance review, and the fleet's CSA score depends on it. A clean, complete 396.17 log with pass/fail on every component and re-inspection tracking is part of what the fleet is paying for. If the inspecting or brake-certified tech's credentials have lapsed, the inspection is invalid, so tracking credential expiry is part of protecting both you and the customer.

How to Price Mobile Diesel & DOT Inspection Jobs

# How to Price Mobile Diesel & DOT Inspection Jobs

Mobile diesel and DOT inspection work has a pricing advantage most trades would kill for: the customer cannot legally operate without you. An out-of-date FMCSA annual inspection sticker parks a truck, and a parked truck loses a fleet hundreds of dollars a day. That urgency is your leverage, but only if you price the work like the compliance service it is rather than a roadside oil change. This guide covers how to set your labor rate, price DOT inspections, build fleet retainers that create recurring revenue, and charge for the mobility that is your whole value proposition.

What You Are Selling: Uptime and a Paper Trail

A fleet manager buys two things from you. First, uptime, keeping trucks legal and running so drivers stay on the road. Second, a defensible paper trail that survives a roadside inspection or an FMCSA compliance review. The FMCSA 396.17 annual inspection has a required checklist, and the record must be retained and reproducible. A shop that hands over a clean, signed 396.17 log with pass/fail on every component is worth more than one that scrawls "passed" on a sticky note, because the fleet's CSA score and roadside outcomes depend on your documentation.

That is why your records are part of the product, not overhead. The Mobile Diesel & DOT Inspection Ops Kit is built around the FMCSA 396.17 checklist log with pass/fail and re-inspection tracking, a per-unit PM scheduler, and a mobile job estimator that already bakes in travel time and shop-supply markup so you stop quoting from your gut.

Set Your Mobile Labor Rate First

Everything prices off your hourly labor rate, and mobile commands a premium over a bay. A stationary diesel shop might bill $110 to $150/hour. Mobile diesel realistically bills $125 to $185/hour because you are absorbing drive time, a stocked service truck, and the convenience of coming to the yard. If you are billing shop rate for mobile work, you are giving away the mobility for free.

Build the rate from cost: your pay, the service truck payment and fuel, tools, insurance, and a target margin. Diesel labor should run 60 to 70 percent gross margin on the wrench time. Then decide how you handle travel. The two clean options:

Trip charge by zone. A flat $45 to $125 depending on distance bands, added to every non-contract call. Simple and transparent.
Portal-to-portal. Bill drive time at a travel rate (often your full labor rate or a modest discount). Better for long hauls, harder for customers to swallow on short trips.

Pick one and apply it consistently. The mistake is quoting "free mobile service" to win a job and then eating a 50-minute round trip on a one-hour repair, which cuts your effective rate nearly in half.

Pricing the DOT Annual Inspection

The FMCSA 396.17 annual inspection is your recurring hook. Every commercial vehicle needs one every 12 months, and the demand is non-negotiable. Typical pricing:

Annual DOT inspection (tractor or straight truck): $85 to $175 per unit, mobile.
Trailer annual inspection: $60 to $120.
Volume fleet inspections (10+ units, one visit): $65 to $110 per unit, because your travel amortizes across the whole yard.

The inspection itself is fast for a qualified inspector, so the value is in convenience and documentation, not wrench hours. Where you make real money is what the inspection surfaces: brake adjustments, light replacements, air-leak fixes, and out-of-service items you can repair on the spot at your mobile labor rate. Price the inspection to get in the yard; profit on the corrections it uncovers. Always separate the inspection line from the repair lines on the invoice so the fleet sees exactly what compliance cost versus what maintenance cost.

Preventive Maintenance and the A/B/C Service Structure

Fleets run PM on intervals, usually an A/B/C tiered schedule keyed to mileage or engine hours:

A service: oil and filter, lube, quick inspection. Roughly $250 to $450 mobile depending on oil capacity (diesel oil changes run 30 to 46+ quarts).
B service: A service plus fuel filters, air filter, more thorough inspection, DEF check. Roughly $450 to $750.
C service: B plus transmission and differential service, coolant, and deeper driveline work. $800 to $1,500+.

Price each tier as a package, mark up shop supplies and consumables (DEF, oil, filters) at 25 to 40 percent, and track each unit's interval so you are scheduling the fleet instead of waiting for breakdowns. A fleet on a PM schedule you manage is a fleet that calls you first when something breaks.

The Real Money: Fleet Retainer Contracts

One-off calls pay the bills; per-truck monthly retainers build the business. Offer a fleet a fixed monthly per-unit fee that bundles the annual DOT inspection, scheduled PM, and priority mobile response. A common structure is $75 to $200 per truck per month depending on what is included and vehicle severity of use.

Run the math for a 20-truck fleet at $125/month: that is $30,000/year of contracted, predictable revenue before a single breakdown repair, which you still bill on top. The retainer does three things: it smooths your cash flow, it locks out competitors, and it gives you the scheduling visibility to route efficiently instead of chasing scattered emergency calls. Price the retainer so it covers your baseline inspection and PM labor plus margin, and treat breakdown repairs as billable extras. Fleets happily pay for predictability because unplanned downtime costs them far more than your retainer.

Don't Forget the Credential and Consumables Costs

Two cost categories new operators forget to price in:

1. Inspector qualification and brake certification. FMCSA requires the annual inspector and the brake-inspection tech to meet specific qualification standards, and those credentials expire. Track expiry dates; an inspection signed by a lapsed inspector is invalid and exposes both you and the fleet. 2. Shop supplies, DEF, and disposal. Used-oil and filter disposal, rags, DEF, and consumables are real per-job costs. Charge a shop-supply fee (often 3 to 6 percent of labor, capped) and mark up consumables, or you are subsidizing every job.

Pricing Mistakes That Bleed a Mobile Diesel Business

Shop rate for mobile work. You lose the entire value of coming to them.
Free or flat cheap travel. Long round trips destroy your effective hourly rate.
Pricing the DOT inspection like it is the whole job. The inspection is the door; corrections and PM are the room.
No retainers. Living on emergency calls means unpredictable revenue and constant windshield time.
Not tracking credential expiry. One lapsed brake cert can void inspections and trigger fines.

Price from your true mobile cost, separate compliance from repair on every invoice, and push every good account toward a per-truck retainer. Work through the free operator's guide to script the retainer pitch, because converting one-off callers into contracted fleets is the single highest-leverage move in this trade. The trucks are not going to stop needing inspections, so build the business that owns the paper trail.