Direct answer: If you need easier, one-handed operation for lifting 4- to 6-foot trailer tailgates on open utility trailers with 12″–24″ side rails, a two-sided lift assist system is typically the most effective upgrade. These units reduce stress on hinges, help extend trailer life, and improve loading safety. Best for frequent tailgate use, contractors, and DIY enthusiasts who want a weightless feel when raising or lowering the tailgate. Below are five targeted picks that fit the common 4-foot side rail configuration and offer clear advantages for different needs.
| Product | Best For | Why It Stands Out |
|---|---|---|
| Trailer Gate Lift Assist, JY PERFORMANCE | Most versatile lift assist | Two-sided design helps balance loads, supports 12″–24″ side rails and 4’–6′ tailgates, simple hand lift after installation. |
| Tailgate Utility Trailer Gate Lift Assist System, INZOKK | High-capacity, safer lifting | Advanced two-sided system, weight up to 400 lbs, designed for 4’–6′ tailgates with 12″–24″ rails. Focus on safety and longevity. |
| VEVOR Trail Tailgate Lift Assist | Durable all-weather use | 1.7mm carbon steel, powder-coated, supports up to 180 lbs, adjustable rails 10″–24″ and 4’–6′ tailgates. |
| Ultra-Tow 4ft x 8ft Steel Folding Utility Trailer Kit | Do-it-yourself trailer upgrade | Complete trailer kit with payload capacity and wiring harness; good baseline platform for tailgate and ramp enhancements. |
| Oyviny Vehicle-Side 4-Pin Flat Wiring Harness | Wiring compatibility | Long 5-foot run, color-coded wiring, rubber dust covers for durability; useful alongside lift-assist upgrades for trailer wiring. |
Trailer Gate Lift Assist, JY PERFORMANCE
Features: Liftgate Lift Assist System with 2 sides to prevent uneven stress; compatible with open utility trailers with 12″–24″ side rails and 4’–6′ height tailgates or ramps; installation requires drilling; tailgate can be raised by hand after install.
Best for: Builders and frequent users who need balanced, weightless lifting across both sides for long-term hinge health. This model is chosen for its emphasis on even stress distribution and broad compatibility with common trailer dimensions.
Caution: Installation requires drilling; ensure your trailer frame is suitable for mounting hardware and that clearance is adequate for two-sided operation.
Tailgate Utility Trailer Gate Lift Assist System, INZOKK
Features: 2-sided lift assist ready for 4’–6′ tailgates; supports up to 400 lb; designed to fit open utility trailers with 12″–24″ side rails; provides smoother one-handed operation and reduces hinge wear.
Best for: Tradespeople and hobbyists who need a robust, weight-dispersing system that minimizes manual effort and protects trailer components.
Caution: Check your trailer’s exact rail height and tailgate weight to ensure compatibility and safe operation.
VEVOR Trail Tailgate Lift Assist
Features: Lifts with a steel wire extension and spring power; universal compatibility for dual-side tailgates; rails from 10″–24″ and tailgates 4’–6′ high; built from carbon steel with powder coating for rust resistance.
Best for: Users who prioritize rugged durability and corrosion resistance in all-weather environments. It is a solid upgrade for frequent lifting tasks and heavy loads.
Caution: The maximum load is 180 lbs; verify your tailgate weight to avoid overloading the system.
Ultra-Tow 4ft x 8ft Steel Folding Utility Trailer Kit
Features: 1,170-lb payload; 1,400-lb max GVWR; includes tires, light kit with 4-wire harness, safety chain, and coupler; overall assembled size 135” L x 62¼” W.
Best for: Buyers seeking a ready-to-use trailer platform that can serve as a base for adding tailgate enhancements, including lift assists, ramps, and wiring upgrades.
Caution: Not a dedicated lift-assist product; plan compatible upgrades if you intend to add a tailgate lift system later.
Oyviny Vehicle-Side 4-Pin Flat Trailer Wiring Harness
Features: 5-ft trailer wiring harness with 18 AWG copper wires; color-coded for easy installation; rubber dust cover protects from dust and water; designed for flexibility in trailer wiring installations.
Best for: Trailers requiring a straightforward replacement or extension of 4-pin flat wiring when upgrading tail lights or integrating lift systems.
Caution: Confirm vehicle compatibility and ensure proper routing to avoid pinching or wear on wires during operation.
Buying Guide: Key Considerations For Choosing a Tailgate Lift Assist
What size tailgate and side rails do I have? Verify that the lift assist supports 4’–6′ tailgates and side rails in the 12″–24″ range, which is common for open utility trailers with 4-foot sides.
Two-sided vs single-sided: Two-sided systems balance loads to reduce stress and improves durability on both sides of the tailgate. Consider this if you frequently lift heavy loads or use the trailer in rough conditions.
Weight rating and compatibility: Check the weight capacity (some units handle up to 400 lbs) and confirm compatibility with your trailer model and tailgate height. Do not exceed the recommended limit.
Installation requirements: Some kits require drilling or other modifications. Plan for the necessary tools and ensure you have access to mounting points on your trailer frame.
Durability: Look for powder-coated steel or corrosion-resistant finishes for outdoor trailer use. A robust build reduces maintenance over time in rain, snow, or humidity.
Related wiring: If you add a lift assist, you may also need a wiring kit to connect tail lights or safety sensors. Consider a 4-pin or 5-pin harness as appropriate for your trailer’s electrical system.
Safety features: Enclosed housings and low-profile designs reduce risk of injury. Check for features that protect hinges and prevent accidental disengagement during operation.
Frequently Asked Questions
- What is a two-sided lift assist for trailer tailgates? A system that uses hardware on both sides of the tailgate to balance lifting, reducing stress on hinges and providing smoother operation.
- Will these lift assists fit all open utility trailers? Most are designed for common sizes, especially 12″–24″ side rails with 4’–6′ tailgates, but always verify compatibility with your trailer model and dimensions.
- Do lift assists require electrical power? Some designs are purely mechanical with springs and cables; others may integrate with a vehicle’s electrical system for additional features. Check product specifics for each model.
- Is installation difficult? Installation may require drilling and mounting hardware. If you are not comfortable with hardware installation, consider professional installation or a model with simpler mounting points.
- What is the practical weight limit for these lifts? Lifts range from about 180 lbs to 400 lbs depending on model. Confirm your tailgate weight to avoid overloading the system.
- Should I buy a full trailer kit or a standalone lift assist? If you already own a trailer, a standalone lift assist is often sufficient. If you need a new trailer, a complete kit like Ultra-Tow provides a platform to upgrade with a tailgate lift later.