HV-138190 Helper Spring for RAM ProMaster – Heavy-Duty Rear Support

Is your RAM ProMaster constantly carrying heavy tools, equipment, or camper gear? The MAD HV-138190 helper spring kit is built for you. Engineered to support permanent rear axle load, this heavy-duty progressive spring set helps reduce suspension sag, improves vehicle stability, and increases safety — even under high payload conditions.

Ideal for tradespeople, delivery services, mobile workshops, and full-time camper conversions.

✅ Key Features of the HV-138190


  • Designed for constant heavy loads on the rear axle
  • Maintains ride height under full payload
  • Progressive spring action: soft engagement, firm support
  • Improves stability, safety, and cornering
  • Compatible with stock shocks or optional KONI/Bilstein kits
  • No modifications needed – bolt-on installation


💡 Is the HV-138190 Right for You?

Choose this set if:

  • Your van carries heavy equipment every day
  • You notice rear sagging even when empty
  • You need extra ground clearance and rear control
  • You run a mobile workshop, service van, or off-grid camper


📦 What’s Included

  • 2 progressive helper springs (left/right)
  • Full mounting kit with brackets and bolts
  • Step-by-step instructions
  • Free US shipping, customs cleared


🚐 Popular Applications

  • HVAC or plumbing vans with racking
  • Delivery vans with constant cargo
  • DIY campers with full rear buildouts
  • ProMaster-based Class B RVs or conversions



💲 Order with Confidence

This kit is built for the RAM ProMaster’s rear axle geometry and tested under real-world loading conditions. Shipped directly from Europe, all prices include shipping, import duty, and processing.



👉 Have questions? Contact us and we’ll help you determine if this is the best solution for your vehicle and payload needs.



🔧 Technical Specifications

Specification Details
Part number HV-138190
Axle position Rear
Vehicle fitment RAM ProMaster 1500 / 2500 / 3500 (2014–present)
Load suitability Constant or heavy cargo use
Spring weight Approx. 4.5 kg
Installation time Approx. 45 minutes
Price (incl. shipping & duties) $540.00