Introduction
This instruction manual provides essential information for the Diecast Masters 1/50 Trail King TK120 HDG Lowboy Trailer, model 71137. This highly detailed diecast replica is designed for display and collection purposes, accurately replicating a Hydraulic Detachable Gooseneck (HDG) lowboy trailer with outriggers.
Key Features:
- 1/50 scale diecast replica of a Trail King gooseneck trailer.
- Features a Hydraulic Detachable Gooseneck (HDG) design.
- Equipped with outriggers on both sides of the trailer for enhanced realism.
- Approximate dimensions: 12.25 inches (L) x 2.25 inches (W) x 1.5 inches (H).
- Recommended for ages 14+ years, intended for display only, not for play.
Setup
The Diecast Masters Trail King TK120 HDG Lowboy Trailer comes partially assembled and requires minimal setup. Follow these steps to prepare your model for display or connection to a compatible tractor unit.
- Unboxing: Carefully remove the trailer components from the packaging. Ensure all parts, including the trailer body, gooseneck, and any extension boards or outriggers, are present.
- Attaching the Gooseneck: The gooseneck component is detachable. Align the gooseneck with the front of the trailer body and securely attach it. Some models may feature a pin or screw mechanism for secure attachment.
- Deploying Outriggers (if applicable): If your model includes outriggers, these can typically be extended from the sides of the trailer for a wider load appearance.
- Connecting to a Tractor (Optional): For display with a tractor unit, align the gooseneck's kingpin with the fifth wheel of a compatible 1/50 scale diecast tractor. Ensure a secure connection.

Image: Top-down view of the Diecast Masters 1/50 Trail King TK120 HDG Lowboy Trailer, showcasing its full length and deck.
Operating
This diecast model is primarily for static display. However, its design allows for realistic posing and interaction with other 1/50 scale models.
- Gooseneck Functionality: The HDG (Hydraulic Detachable Gooseneck) feature allows the gooseneck to be detached from the main trailer deck, simulating the loading and unloading process of heavy equipment. This is typically achieved by manually manipulating the gooseneck to detach it from the trailer's front.
- Outrigger Extension: The outriggers on the sides of the trailer can be extended to represent wider loads, adding to the realism of your display.
- Rolling Wheels: The trailer features free-rolling wheels, allowing for smooth movement when pushed manually. This enables dynamic posing with compatible tractor units and loads.

Image: Close-up view of the detachable gooseneck mechanism on the Diecast Masters 1/50 Trail King TK120 HDG Lowboy Trailer.
Official Product Videos:
Video: This video demonstrates the features and operation of the 1:16 Radio-Control XL 120 Low-Profile Hydraulic Detachable Gooseneck Trailer, showcasing its functionality and interaction with other models. While a different scale, the video illustrates similar operational principles for the HDG lowboy trailer.
Video: A product overview video from Diecast Masters America, highlighting various features and details of their models, including trailers.
Maintenance
Proper care will ensure the longevity and pristine condition of your diecast model.
- Cleaning: Dust regularly with a soft, dry cloth.
- Avoid Chemicals: Do not use water or harsh chemicals, as these can damage the paint finish or plastic components.
- Handling: Handle the model with care to prevent accidental damage to delicate parts.
- Storage: Store the model in a cool, dry place away from direct sunlight to prevent fading or material degradation.
Troubleshooting
While diecast models are generally robust, minor issues can sometimes arise. Here are some common concerns and their solutions:
- Loose Parts: If small parts become loose, they can often be reattached using a small amount of model-safe adhesive. Ensure the adhesive is suitable for metal and plastic.
- Scratches or Paint Chips: For minor blemishes, touch-up paint matching the model's color can be used. Consult a hobby specialist for appropriate products.
- Stiff Moving Parts: If the wheels or gooseneck mechanism become stiff, ensure no dust or debris is obstructing movement. A small amount of dry lubricant (e.g., graphite powder) can be applied sparingly if needed, avoiding painted surfaces.
For more complex issues or significant damage, it is recommended to contact Diecast Masters customer support or a professional model repair service.
Specifications
| Brand: | Diecast Masters |
| Model Number: | 71137 |
| Scale: | 1/50 |
| Type: | HDG Lowboy Trailer (Diecast Replica) |
| Color: | Black (Outrigger Version) |
| Material: | Metal |
| Approximate Dimensions: | 12.25in L x 2.25in W x 1.5in H |
| Recommended Age: | 14+ years (for display only, not for play) |
| Item Weight: | 1 Pound |
Warranty and Support
For information regarding product warranty, returns, or technical support, please refer to the official Diecast Masters website or contact their customer service department. Keep your purchase receipt as proof of purchase.
You can visit the Diecast Masters Store on Amazon for more information and contact options.





