Describe What the Slab Will Carry
Passenger vehicles, loaded trucks, storage, and equipment can create different demands. Give the project team specific information about expected use, rather than describing everything as heavy duty.
Thickness Is Only One Part
Thickness works with support, reinforcement, joints, concrete properties, and drainage. Increasing one dimension does not automatically correct shortcomings elsewhere.
Prepare for an Estimate
Collect the project location, approximate dimensions, drawings if available, access information, existing concrete conditions, and target schedule. Truck scale work also needs the selected equipment's drawings and specifications.
Define the intended use before comparing concrete proposals.
Further Reading
American Concrete Institute — Guide to Design of Slabs-on-Ground (preview)General education for project planning. Your site's conditions and project requirements determine the construction details.