Vehicle Roll Assessments for Modified Mining & Heavy Vehicles
When OEM Design Intent Meets Real-World Mine Modifications
Modern mine sites rely on heavy vehicles that are often modified well beyond their original OEM configuration. While manufacturers such as Caterpillar, Volvo, and Komatsu design machines for specific duties; haulage, earthmoving, or material handling; the realities of mining operations frequently demand something different.
A standard haul truck may have its tub removed and replaced with:
A water cart tank
An agitator or service module
A custom process or support system
Specialised mine services equipment
Once these changes occur, the vehicle is no longer operating within the OEM’s original design envelope. That’s where independent vehicle roll and stability assessments become critical.
Why Vehicle Roll Assessments Are Required After Modifications
When a heavy vehicle is modified, several fundamental engineering assumptions change, often simultaneously.
Key risks introduced by vehicle modifications include:
Changes to centre of gravity (CoG)
Altered axle loads and load distribution
Increased rollover risk on slopes, corners, or uneven ground
Increased stresses on chassis, suspension, and mounting points
From a safety and compliance perspective, mine operators and contractors must be able to demonstrate that a modified vehicle:
Is fit for purpose
Does not introduce unacceptable rollover risk
Can safely operate within site-specific conditions
Trang provides engineering-based vehicle roll assessments to support these requirements.
What Is a Vehicle Roll Assessment?
A vehicle roll assessment is a structured engineering evaluation of a machine’s stability and safety margins, considering both static and dynamic operating conditions.
At Trang, this typically includes:
1. Review of OEM Baseline Configuration
Original OEM design intent
Standard axle loads and mass distribution
Published stability limits (where available)
2. Assessment of the Modified Configuration
Updated vehicle mass and payload
Revised centre of gravity location
Geometry changes due to tubs, tanks, frames, or equipment
Mounting arrangements and load paths
3. Stability & Roll Risk Analysis
Static rollover thresholds
Operating slope and crossfall limits
Turning and braking considerations
Effects of liquid loads (for water carts and tanks)
4. Identification of Secondary Risks
Roll assessments often uncover additional engineering issues, such as:
Overloaded axles or suspension components
Excessive chassis stresses
Mounting fatigue risks
Clearance or interference issues
This broader review is often just as valuable as the rollover analysis itself.
Common Vehicles Requiring Roll Assessments
Trang regularly undertakes roll and stability assessments for:
Modified haul trucks
Water trucks / water carts
Agitator and service trucks
Fuel and lube vehicles
Custom mine support vehicles
Articulated and rigid dump trucks with non-OEM bodies
These assessments are commonly required for:
Mine owner approvals
Contractor onboarding
Site safety management systems
Engineering sign-off and documentation
Why Independent Engineering Assessment Matters
OEMs design vehicles for specific applications. Once a machine is modified:
OEM warranties may no longer apply
OEM stability data may no longer be valid
Responsibility shifts to the operator and modifier
An independent engineering assessment provides:
Objective, defensible analysis
Documentation suitable for mine site audits
Confidence that risks have been identified and managed
A clear engineering basis for operational limits or controls
Trang’s role is not to redesign the vehicle but to assess, quantify, and clearly communicate the risks introduced by modification.
Trang’s Approach to Vehicle Roll Assessments
Trang brings together:
Mechanical engineering expertise
Heavy vehicle and mining equipment experience
Practical understanding of mine site operations
When Should You Engage Trang?
You should consider a vehicle roll assessment when:
A vehicle has been modified from OEM configuration
New equipment or payloads are installed
A machine is repurposed for a different task
A mine site requires independent engineering sign-off
There are concerns about stability, loads, or safety margins
Need a Vehicle Roll or Stability Assessment?
If you operate or supply modified mining or heavy vehicles, Trang can help you understand and manage the risks before they become a safety or compliance issue.
Contact Trang to discuss vehicle roll assessments, modified equipment reviews, and independent engineering support for mine sites.