Mobile Clean Air Check Testing for Semi-Trucks & RVs in the Central Valley

Whether you're an owner-operator running a single semi-truck or an RV owner navigating California's emissions requirements, ST Pros makes the testing process as straightforward as possible. We provide mobile Clean Air Check testing for eligible semi-trucks and RVs throughout California's Central Valley — coming directly to your location so you can complete required emissions testing without the hassle of scheduling a trip to a testing facility.


ST Pros has served individual vehicle owners throughout the Central Valley for over 20 years. We understand that for owner-operators and RV owners, time off the road or away from your vehicle is time and money you can't afford to waste. Our mobile testing service is designed to minimize exactly that.

Silver semi-truck parked in a shipping yard with stacked cargo containers in the background
White camper van parked on a rural road beside greenery at sunset

Semi-Truck Clean Air Check Testing

Owner-operators and trucking professionals with individual semi-trucks can count on ST Pros for convenient, professional mobile Clean Air Check testing throughout the Central Valley. We come to your yard, your truck stop, your business address, or another convenient location — wherever your semi-truck is parked, we can test it there.


A typical semi-truck Clean Air Check takes approximately 20 minutes. Results are submitted to the state system within 24 hours, keeping your Clean Truck Check compliance records current. If you have multiple trucks at the same location, we can test each one during the same visit — and fleet pricing applies when multiple vehicles are tested together.

RV Clean Air Check Testing

Eligible RV owners in California's Central Valley can also take advantage of ST Pros's mobile testing service. We come to your home, your storage facility, your RV park, or another convenient location to perform the Clean Air Check — no need to drive your RV to a testing facility or work around facility schedules.


RV testing requirements under California's Clean Truck Check program depend on the specific vehicle type, weight, and equipment. If you're unsure whether your RV is subject to testing requirements, contact ST Pros at 559-824-4291 and we'll help you understand the applicable requirements for your vehicle.

White semi-truck driving on a rural highway under a blue sky
White RV parked on a grassy campsite beside trees and neighboring trailers.
Chrome engine in a vehicle engine bay, with exposed exhaust pipes and turbocharger.
Blue semi-truck parked at a warehouse loading dock with trailer attached

Why Individual Owners Choose ST Pros

We come to you — at your location, on your schedule

Approximately 20 minutes per vehicle — fast and professional

Results submitted to the state within 24 hours

Licensed and insured mobile testing professionals

20+ years of Central Valley emissions testing experience

Transparent pricing — call for current rates and available discounts

Military discounts available for eligible customers

Call or text anytime — 559-824-4291

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Serving the Full Central Valley

ST Pros serves semi-truck and RV owners throughout Fresno, Clovis, Madera, Selma, Bakersfield, and surrounding Central Valley communities within approximately a 75-mile radius of Clovis. Call or text us to confirm service to your location.

Semi-Truck & RV FAQs

  • Do you test semi-trucks?

    Yes. ST Pros provides mobile Clean Air Check testing for semi-trucks and other eligible heavy-duty vehicles throughout California's Central Valley. We come directly to your location, making it convenient for owner-operators, trucking companies, and commercial fleets to complete applicable emissions testing requirements.

  • Do you service RVs?

    Yes. ST Pros provides mobile Clean Air Check testing for eligible RVs throughout California's Central Valley. We come directly to your location — your home, storage facility, or RV park — making it convenient to complete applicable emissions testing without the hassle of taking your RV to a testing facility.

  • Can ST Pros test my semi-truck at a truck stop or yard?

    Yes — we come to wherever your truck is located. Whether that's a truck stop, a yard, your business address, or another location, ST Pros can perform the mobile Clean Air Check there. Call or text 559-824-4291 to confirm your specific location and schedule your appointment.

  • What does the testing involve for a semi-truck or RV?

    A Clean Air Check involves on-site emissions testing of the vehicle's exhaust output to assess compliance with applicable CARB standards. The test takes approximately 20 minutes per vehicle. Simply have the vehicle accessible and running when our mobile testing team arrives. We handle the equipment, the test, and the state submission.

Schedule Your Semi-Truck or RV Clean Air Check — Call or Text 559-824-4291