A dual belt conveyor carries both sides of a vehicle through a wash. A retrofit belt modernizes an existing tunnel using a belt beneath the driver’s side tires. A detail belt is a wide moving work platform for vehicles and detailing crews. The right starting point depends on the job you need the conveyor to do.
This guide draws on Understanding Car Wash Belt Conveyor Systems by Lawrence S. Stovall, II, particularly the chapters on conveyor types and system selection. His central advice is practical: understand your operation before comparing equipment proposals.
Compare the three conveyor types
| Conveyor type | What it does | Typical application | First question |
|---|---|---|---|
| Dual belt | Supports the tires on both sides of the vehicle on moving belts. | Express exterior, full-service and dealership wash tunnels. | What loading method and vehicle mix must the system accommodate? |
| Retrofit belt | Supports the driver’s side tires while the passenger-side tires roll on the floor. | Modernizing an existing over/under conveyor installation. | How can the design work with the existing building, pit and utilities? |
| Detail belt | Moves vehicles and provides a working platform for detailing employees. | Interior cleaning, finishing and detail production lines. | How should tasks, people and workstations be arranged? |
Dual belt conveyors: plan around the wash and loading experience
In a dual belt system, two belts support the vehicle’s left and right tires. The vehicle travels with those belts through the wash. This arrangement provides a broad loading surface and continuous support on both sides of the vehicle.
Dual belts are worth evaluating for new tunnels and projects where the owner wants to redesign the loading experience. Depending on the particular system, loading may be guided by an attendant or coordinated through customer instructions, sensors and controls.
Start with the vehicles your customers actually drive. Tire width, vehicle clearance, wheelbase and load capacity belong in the equipment discussion. A broad belt alone does not establish compatibility with every vehicle or with the rest of the wash equipment.
Also decide how the entrance and exit will operate. Staffing, customer guidance and control integration are part of the system selection—not details to resolve after the conveyor is ordered.
Retrofit belt conveyors: evaluate the existing facility first
A retrofit belt can provide a way to update an existing over/under conveyor while making use of much of the original conveyor space. In the design described in Lawrence’s book, the driver’s side tires ride on the belt and the passenger-side tires continue rolling along the tunnel floor.
That distinction matters. A retrofit does not behave exactly like a full dual belt system. Because one side of the vehicle still rolls on the floor, braking and steering can still affect its movement.
The potential benefit is a renovation designed around a building you already own. Engaging the vehicle at the front tire may also reduce the loading distance required by some existing roller arrangements. The amount of space available—and any construction savings—must be checked against the actual site and proposed equipment.
Bring measurements, photographs and information about the current conveyor to the first discussion. Drainage, foundations, electrical service, pit condition and equipment clearances can all affect what is practical.
For a closer look at renovation planning, read Can You Convert an Existing Car Wash to a Belt Conveyor?
Detail belt conveyors: design the work around the people
A detail belt serves a different part of the operation. It is a wide moving platform that supports the vehicle and the employees carrying out cleaning or finishing work. It can be used in full-service washes, detail centers, dealerships and fleet facilities.
The goal is a consistent sequence of workstations. One team member might vacuum while another handles glass or interior surfaces, with tasks arranged to match the movement of the vehicle.
The belt itself is only one part of that plan. Tool placement, lighting, vacuum access, employee movement, workstation spacing and conveyor speed all influence how well the line works. A detail belt should be evaluated as an entire production process.
Six questions to answer before requesting a proposal
- What business are we building? Define the wash format, anticipated volume, detailing services and staffing plan.
- What vehicles must we serve? Identify the largest vehicles, tire sizes, clearances and loads that matter in your market.
- What does the site allow? Document the building, conveyor space, drainage and utilities. Have the installation requirements reviewed for the specific project.
- How will customers load and exit? Discuss attendant guidance, signage, sensors and how the conveyor coordinates with the wash equipment.
- What is included in the price? Compare freight, site work, installation, controls, startup, training and support as well as the conveyor itself.
- How will the system be maintained? Ask about inspection requirements, access to components, replacement parts and available service support.
Equipment design, installation quality, training and operating procedures all contribute to safe, dependable operation. Follow the selected system’s instructions and use qualified professionals to address the conditions at your site.
Match the conveyor to your long-term plan
If the priority is transporting vehicles through a new wash tunnel, begin by evaluating dual belts. If the priority is modernizing an existing roller-conveyor facility, investigate retrofit options. If the priority is organizing interior cleaning and finishing work, examine a detail belt production line.
These are starting points for a discussion. The best choice comes from comparing the complete system against your building, customers, employees and future plans.
Help me choose the right conveyor →
Already have a project in mind? Request an equipment quote, or download the Belt Conveyor Comparison Guide (PDF).
Source: Lawrence S. Stovall, II, Understanding Car Wash Belt Conveyor Systems, First Edition (2026), Chapters 4–7 and 9. Adapted for AutoBrite Company.