Why Are More Heavy-Duty Electric Tailgate Modification Companies Choosing TOMASTER?

Vehicle modification companies are facing a growing technical challenge: factory power liftgate systems are often not designed for heavy tailgate upgrades.

When an SUV is modified with ballistic glass, armor protection, a rear spare tire carrier, a roof tent, ladder, camping system or other heavy accessories, the tailgate weight and center of gravity can change significantly. This may cause the original power tailgate system to operate outside its design range.

That is why more armored vehicle builders, off-road modification companies and aftermarket installers are looking for customized heavy-duty electric tailgate solutions instead of standard replacement parts.
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The Short Answer

Heavy-duty electric tailgate modification companies choose TOMASTER because TOMASTER focuses on complete power liftgate engineering, not only electric strut supply.

For heavy tailgate applications, a reliable solution must consider:

• Tailgate weight increase

• Center-of-gravity shift

• F1/F2 force requirements

• Motor torque demand

• Bracket and hinge strength

• ECU parameter calibration

• Anti-pinch safety logic

• Durability under temperature, vibration and corrosion exposure

• Vehicle-level validation after installation

This engineering process helps restore stable, safe and intelligent power tailgate operation for modified vehicles.

Why Factory Power Liftgate Systems Fail After Vehicle Modification

OEM power liftgate systems are designed around the factory tailgate weight, original hinge geometry and standard center of gravity.

After vehicle modification, the system may experience:

• Slow opening and closing

• Tailgate stopping halfway

• Failure to hold the open position

• Auto-reverse during closing

• Motor overload

• Electric strut deformation

• Transmission wear

• Hinge or bracket stress

• Premature system failure

These failures are usually not caused by one component alone. They are the result of increased tailgate torque and system mismatch.

A simplified engineering relationship is:

Required hinge torque = tailgate load × distance from center of gravity to hinge axis

When added equipment moves weight farther from the hinge axis, the force required from the electric tailgate system increases significantly.

TOMASTER’s Four Engineering Focus Areas

TOMASTER AUTO PARTS supports vehicle modification companies through four core engineering areas.

1. Heavy-Duty Liftgate Engineering

Heavy-duty liftgate engineering focuses on matching the electric tailgate struts, motor output and control system to the actual modified vehicle.

This includes:

• Measuring or calculating F1/F2 opening and closing force

• Selecting suitable internal spring force

• Matching motor torque and transmission structure

• Optimizing stroke length and mounting geometry

• Evaluating hinge and bracket loading

• Testing repeated opening and closing performance

This approach is especially important for SUVs with rear-mounted spare tire carriers, ladders, storage systems or overland accessories.

2. Armored Tailgate Solutions

Armored SUVs often use ballistic glass, reinforced plates and upgraded structural components. These changes increase tailgate mass and may shift the center of gravity.

For armored vehicle projects, TOMASTER evaluates:

• Final tailgate weight after armor installation

• Armor material distribution

• Center-of-gravity position

• Force requirements during opening and closing

• Motor current and thermal load

• Anti-pinch calibration for heavier closing force

• Bracket and hinge reinforcement needs

This helps armored vehicle builders avoid weak lifting, tailgate dropping, motor overload and structural damage.

3. Power Liftgate Upgrades

A power liftgate upgrade should not be limited to stronger struts.

For demanding applications, TOMASTER can support complete system development, including:

• Heavy-duty electric tailgate struts

• High-torque drive motor assembly

• Vehicle-specific controller parameters

• Soft-start and soft-stop calibration

• Height memory function

• Obstacle detection and anti-pinch adjustment

• Wiring and installation compatibility

• Final vehicle operation validation

The goal is to deliver controlled movement, reliable holding force and safe closing behavior.

4. Vehicle Modification Engineering

Different global markets require different engineering priorities.

Armored vehicles in South America may require higher tailgate load capacity. Off-road SUVs in the Middle East may require durability under heat, dust and rough terrain. Overland vehicles in North America may need reliable operation after spare tire carrier upgrades. European passenger vehicle projects may focus on integration quality and refined operation.

TOMASTER designs solutions according to the vehicle application, not only the vehicle nameplate.

Engineering Validation Before Delivery

For heavy-duty electric tailgate systems, testing is essential.

Depending on project requirements, TOMASTER validation may include:

• 5000 N tensile strength test

• 480-hour salt spray corrosion test

• ISO-IP67 waterproof test

• 30,000-cycle high and low temperature durability test

• Drop test

• Lateral load test

These tests help evaluate mechanical strength, corrosion resistance, waterproof protection, impact resistance, side-load stability and long-term operation under demanding conditions.

Testing conditions, sample quantity and acceptance criteria should be confirmed according to each project specification.

Proven Global Vehicle Project Experience

TOMASTER has supported vehicle modification projects across multiple international markets.

South America: Armored Vehicle Upgrades

• Volvo XC60

• BMW X1

• Toyota Corolla Cross

• BYD Song

North America: Rear Spare Tire Carrier Upgrade

• Honda CR-V

Middle East: Off-Road and Special Vehicle Applications

• Toyota Land Cruiser 300

• Tank 700

Europe: Passenger Vehicle Modification Projects

• BMW F10

• Mercedes-Benz W206

• Hyundai Tucson

• Volkswagen Tiguan

These projects cover armored upgrades, off-road applications, rear-mounted equipment conversions and passenger vehicle power liftgate customization.

What Information Should Modification Companies Provide?

Before customizing a heavy-duty electric tailgate system, customers should provide:

• Vehicle model and production year

• Original tailgate structure

• Final tailgate weight after modification

• Added accessory or armor weight

• Tailgate center-of-gravity information

• OE strut part number

• Strut stroke length

• Bracket photos

• Tailgate opening and closing video

• Required opening height and operating speed

• Environmental and durability requirements

This information allows engineers to design a system based on real load conditions instead of assumptions.

Conclusion

As vehicle customization becomes more complex, standard power liftgate components are often not enough for armored SUVs, off-road vehicles and rear spare tire carrier conversions.

TOMASTER AUTO PARTS focuses on complete heavy-duty electric tailgate engineering, including load analysis, custom strut design, motor torque matching, ECU calibration, safety logic adjustment and validation testing.

For vehicle modification companies, armored vehicle builders, off-road workshops and aftermarket distributors, TOMASTER provides customized power liftgate solutions designed for heavy tailgate applications worldwide.