How to Ship a Knuckleboom Loader: Complete Transport Guide
Knuckleboom loaders — also called log loaders or knuckle-boom log loaders — are specialized forestry machines used to sort, stack, and load timber at landing zones and sawmill yards. These machines are notable for their extreme length in transport configuration (up to 52 feet) and their articulated boom arms that must be carefully stowed before moving. IronHaul Logistics has experience transporting knuckleboom loaders from logging operations, sawmills, and auction yards across the United States.
Knuckleboom Loader Dimensions and Weight
Knuckleboom loaders have a distinctive transport profile due to their long boom arms. When stowed for transport, the boom folds back over the machine, creating a long but relatively narrow profile:
| Specification | Typical Range | Example (Weiler K560/K760) |
|---|---|---|
| Transport Length | 45–55 ft | 52 ft 1 in |
| Transport Width | 8–9 ft | 8 ft 6 in |
| Transport Height | 12–14 ft | 13 ft 3 in |
| Operating Weight | 40,000–80,000 lbs | Varies by model |
| Engine Power | 150–200 hp | ~173 hp |
| Max Horizontal Reach | 30–40 ft | ~32 ft |
Always verify your specific machine's transport dimensions with the manufacturer spec sheet. The stowed boom configuration is critical — confirm with the operator that the boom is properly locked in transport position before loading.
Federal Permit Thresholds
- Length: Federal legal limit for a single vehicle is 48 ft (53 ft for trailers). A knuckleboom loader at 52 ft in transport configuration, loaded on a trailer, will create a combined length that requires an oversize permit in most states.
- Width: Legal limit is 8.5 ft. Many knuckleboom loaders are at or just over this limit in transport configuration, requiring overwidth permits.
- Height: Legal limit is 13.5 ft. At 13 ft 3 in transport height, the machine itself is within limits, but the combined height with the trailer deck must be verified.
- Weight: Federal GVW limit is 80,000 lbs. Heavier knuckleboom loaders may require overweight permits.
Trailer Selection
The extreme length of a knuckleboom loader in transport configuration is the primary challenge for trailer selection:
- Lowboy / RGN (55'–60' deck): The most common choice. The low deck height (18–24 inches) keeps the total load height within legal limits. RGN trailers allow the machine to be driven on under its own power. The long deck accommodates the machine's transport length.
- Extended Lowboy: For very long machines, an extended lowboy with a 60+ ft deck may be required. These are specialized trailers that require advance booking.
- Avoid flatbed and step deck: The machine's height in transport configuration typically exceeds what a flatbed or step deck can accommodate while staying within legal height limits.
Loading Considerations
- Boom stow verification: Before loading, confirm that the boom is fully stowed and locked in the transport position. An improperly stowed boom can shift during transit, creating a safety hazard and potentially damaging the machine or trailer.
- Counterweight position: Some knuckleboom loaders have adjustable counterweights. Confirm the counterweight is in the transport position before loading.
- Cab clearance: The cab height in transport configuration must be verified against the trailer deck height to ensure the total load height is within legal limits.
- Drive-on loading: If the machine is operational, it can typically be driven onto an RGN trailer. The long machine requires careful alignment with the trailer — experienced operators are essential.
- Site access: Knuckleboom loaders are often located at sawmill yards or logging landings with limited space. Provide your carrier with site dimensions so they can confirm the trailer can maneuver for loading.
Tie-Down Requirements
- Minimum 4 tie-down chains for machines over 10,000 lbs, rated to at least 50% of machine weight per point
- Chains attached to designated frame tie-down points — not to boom arms, hydraulic cylinders, or cab
- Boom must be additionally secured with chains or straps to prevent movement during transit
- Wheel chocks required for wheeled machines
Cost Factors
- Specialized trailer: Long-deck lowboy or RGN trailers carry a premium over standard equipment.
- Oversize permits: Length and width permits required in each state on the route.
- Escort vehicles: May be required depending on load width and state requirements.
- Site access: Difficult pickup locations add cost for additional setup time and equipment.
IronHaul Logistics has the specialized trailers and experienced drivers needed to move knuckleboom loaders safely. Call (208) 495-2260, email [email protected], or submit your machine's specs online for a fast, accurate quote.
Common questions
What trailer do I need to ship a knuckleboom loader?
Most knuckleboom loaders require a lowboy or RGN trailer with a long deck (55–60+ ft). The machine's transport length (up to 52 ft) and height (up to 13+ ft) make flatbed and step deck trailers unsuitable for most models.
How long is a knuckleboom loader in transport configuration?
With the boom stowed, most knuckleboom loaders are 45–55 ft long. The Weiler K560/K760, for example, is 52 ft 1 in in transport configuration. This length, combined with the trailer, creates a total combination length that requires oversize permits in most states.
Can a knuckleboom loader be driven onto the trailer?
Yes, if the machine is operational and the trailer is an RGN with a removable gooseneck, the machine can be driven on. The long machine requires careful alignment — experienced operators are essential for safe loading.
Do I need oversize permits to ship a knuckleboom loader?
Yes. The combination of length, width, and sometimes height will require oversize permits in each state on the route. IronHaul handles all permit applications as part of the move.
How much does it cost to ship a knuckleboom loader?
Cost depends on distance, machine dimensions, and site access. Most knuckleboom loader moves run $3,000–$10,000+ depending on the route length and oversize requirements. Contact IronHaul for an accurate quote based on your specific machine and route.
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