Overview Mountain aluminum arms feature an "Unbreakable" profile that places more aluminum at the outer edges along the primary direction of force compared to a simple thin-walled round tube of equal weight. This means that they are stronger vertically while also maintaining horizontal torsion, making them more likely to withstand an impact than other arm shapes.
Made from High-Grade Extruded Aluminum, they come in both straight and bent versions with the option to customize the bend to what you need.
Common bends are:
12” - Standard for Single-Axle Bodies or Medium-Duty Dump Trucks
16” - Common for Ox Bodies, Heavy-Duty, Tandem or Tri-Axle Dump Trucks
24” - Useful for taller bodies and Underbody Systems
36” - Works best with larger trailers including End Dump, Transfer and Demolition Trailers
Size Guide Mountain recommends the following arm lengths based on bed size:
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