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Most carts use four casters — commonly 2 swivel and 2 rigid — but heavier or larger equipment sometimes uses six or more to keep the load-per-caster figure within a safe range and to support longer frames.
The core calculation is total loaded weight divided by the number of casters, with a safety factor applied — if that per-caster figure is too high for a reasonably-priced caster at four casters, adding more casters is often more practical than searching for an unusually high-capacity option.
Sizing a new cart build, especially for long, heavy, or irregularly-loaded equipment.
Assuming four casters is always correct regardless of load. For very heavy or long equipment, six or more casters can keep per-caster load in a more reasonable, cost-effective range.
When would I need more than 4 casters?
Heavier loads, longer equipment needing more support points, or when spreading load further keeps individual caster capacity requirements more reasonable.
Does adding more casters always help?
Generally yes for load distribution, but very long equipment also needs enough rigid casters positioned to maintain straight tracking, not just added swivel casters.
