Low-maintenance slider system for dry-freight, refrigerated and specialty van trailers

ULTRAA-K Lightweight Tandem Slider Technology for Dry Van Reefer

Hendrickson introduces the latest in air slider technology with the ULTRAA-K® axle suspension system – the next generation VANTRAAX® air slider system for the van and refrigerated trailer markets. Building on proven VANTRAAX air slider design expertise, the ULTRAA-K system is engineered with an optimized strength-to-weight ratio making it stronger than comparable standard and heavy duty 40K slider models in the market today. It is the lightest slider system in the industry by nearly 100 pounds.

Hendrickson recommends reviewing our application guide when choosing the suspension that best meets your needs.  
 L707 Application Guide

ULTRAA-K Lightweight Tandem Slider Technology for Dry Van Reefer

Features and Benefits

Improved Air Spring Supports

  • Increases strength and durability
  • Easier access to air spring mounting studs

Diagonal “K” Bracing

  • Prevents racking
  • Increases strength and slider life

Overlapping Frame Brackets

  • Stronger attachment
  • Improves durability and hanger life

Optimized Slider Rail

  • Optimized structural geometry
  • Stronger than VANTRAAX 40K HD model
  • Reduces weight

Hat-Section Cross Members and Gussets

  • More rigid design
  • Longer slider life

Height Control Valve Mounting

  • Ensures more accurate ride height settings
  • More secure location protects against road debris

Exclusive ZMD® Shockless Ride Technology

  • Uniform damping levels over life of the trailer
  • Reduces overall suspension maintenance
  • Superior ride quality and driver comfort
  • Enhances cargo protection
  • Reduces risk of roadside tickets and CSA violations

Pivoting Mud Flap Brackets

  • Helps prevent mud flap damage
  • Reduces component maintenance

New SURELOK® System Design

  • Eliminates stop bolt
  • Less component wear


Model Axle Spacing
System Capacity
Axle Rating (lbs.) Axle Dia.
Box Width
Ride Height
Model Weight
ULTRAA-K 49 40K 20K LDA 48 16 1290


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