What is the Hendrickson PRIMAAX EX?
PRIMAAX EX is Hendrickson’s severe-duty vocational rear air suspension. The manufacturer lists single, tandem and tridem configurations. Those configurations have different ratings, so a PRIMAAX EX label alone cannot identify axle count, capacity or the application approved for an individual truck.
What matters in a comparison
For a PRIMAAX EX vehicle, record the exact suspension model and installed axle arrangement. Compare the documented ride height and application with the body and working loads. The manufacturer’s site-travel and vehicle-rating figures describe different conditions; do not treat them as interchangeable payload permissions. Have the as-built configuration checked before considering a change in body or operating duty.
Questions to take to the supplier
- Which model and axle arrangement are installed?
- What ride height and application were approved?
- Does the intended body change require a new assessment?
Sources & limits
Manufacturer material supports the identification and overview above. Comparison considerations and supplier questions are Truck University’s original editorial interpretation, prepared with AI assistance. They are not an independent performance test or expert inspection.
Model-family reference only. Availability, specifications and service requirements can differ by year, market and configuration. Verify the actual vehicle or component using its identification and current manufacturer documentation. Do not use this page as a parts-fitment, modification, repair or loading instruction.
Published specifications and examples retain their labelled units; the header preferences apply to calculators.
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