The van
- 2019 RAM ProMaster 2500, High Roof, 159" WB (FWD)
- Camper conversion: cabinets, galley (driver side), lithium bank
- Suspension baseline: stock springs & dampers
Vehicle & Loadout
As traveled
- 2 adults + 1 dog, full fuel
- ~25 gal fresh water, bikes + camping gear
- Tires at door-label pressures
The kit
- MAD HV-138200 rear helper springs
- Progressive support under load
- Bolt-on, no drilling
This is a representative, real-world example. Results vary with axle loads, layout, and accessories.
Symptoms (Before)
- Rear sag when loaded; slight right-hand lean at camp
- Pronounced wallow on rolling highway dips
- More steering correction in crosswinds
- Noticeable pitch under hard braking
Measurements: Before vs After
Ride Height (hub center → fender lip)
| Position | Empty (Before) | Loaded (Before) | Loaded (After HV-138200) | Change Loaded |
|---|---|---|---|---|
| Front Left (FL) | 415 mm (16.3") | 405 mm (15.9") | 406 mm (16.0") | +1 mm (+0.04") |
| Front Right (FR) | 412 mm (16.2") | 401 mm (15.8") | 402 mm (15.8") | +1 mm (+0.04") |
| Rear Left (RL) | 400 mm (15.7") | 370 mm (14.6") | 392 mm (15.4") | +22 mm (+0.9") |
| Rear Right (RR) | 395 mm (15.6") | 360 mm (14.2") | 388 mm (15.3") | +28 mm (+1.1") |
Scale Weights (loaded, as traveled)
| Measurement | Value | Notes |
|---|---|---|
| Front Axle | 3,520 lb (1,596 kg) | Within door-sticker limits |
| Rear Axle | 4,620 lb (2,096 kg) | Near rated limit → support recommended |
| Gross | 8,140 lb (3,693 kg) | Under GVWR; always verify your sticker |
Suspension upgrades improve stance and control but do not
change GVWR/GAWR. Stay within the ratings on your door sticker.
Install Overview
Time & difficulty
- ~45–75 minutes per rear axle (lift & hand tools)
- Bolt-on; no drilling
High-level steps
- Chock front wheels; raise rear safely; support with stands
- Unload rear axle; position HV-138200 per instructions
- Bolt up brackets and spring pack; align seats
- Tighten to manufacturer torque specs
- Re-check clearances, lower, test drive, re-torque
Tips
- Measure hub→fender before & after for comparison
- Re-torque after first 100–200 miles
- Pair with quality rear dampers for best control
Driving Impressions
- Stability: far less wallow over highway undulations; tighter rear response
- Crosswinds: fewer steering corrections; feels calmer at 100–110 km/h (60–70 mph)
- Braking: reduced pitch; less “diving” sensation
- Comfort (empty): near-stock ride thanks to progressive engagement
- Stance: rear sits visibly more level when loaded; right-hand lean reduced
“With the HV-138200 the van finally drives like it looks—planted. The rear doesn’t wallow and crosswinds are no longer tiring.” — LLS customer
Photo Gallery
FAQs
Will HV-138200 fit my ProMaster?
It’s designed for popular RAM ProMaster variants. Check compatibility on the kit page and select your year/wheelbase/axle.
Does it change my legal weight ratings?
No. It improves support and stability under load but does not change GVWR/GAWR. Always stay within door-sticker limits.
Can I pair it with better shocks?
Yes—helper springs plus quality dampers is often the best combo for control without sacrificing comfort.
What improvement in ride height should I expect?
Depends on load and build; in this case we saw ~22–28 mm (0.9–1.1") rear gain when loaded.
