How to Ship an Asphalt Milling Machine: Dimensions, Trailers & Permits

Asphalt Milling Machine Dimensions and Weight by Size Class

Cold planers come in three broad size classes, each with different transport requirements:

Compact / Half-Lane Millers (up to 4 ft cutting width)

• Weight: 30,000–55,000 lbs
• Width: 6–8 ft in transport position
• Height: 9–11 ft in transport position
• Length: 18–24 ft
• Typical trailer: Step-deck or lowboy
• Permit required: Usually not for width/height; may require overweight permit depending on trailer configuration

Mid-Size Millers (4–7 ft cutting width)

• Weight: 55,000–90,000 lbs
• Width: 8–10 ft in transport position
• Height: 10–12 ft in transport position
• Length: 24–35 ft
• Typical trailer: Multi-axle lowboy or RGN
• Permit required: Overweight permit required; oversize permit if width exceeds 8.5 ft

Full-Lane Millers (7–14 ft cutting width)

• Weight: 90,000–130,000 lbs
• Width: 10–14 ft in transport position (drum housing may extend beyond machine body)
• Height: 11–13 ft in transport position
• Length: 35–50 ft
• Typical trailer: Multi-axle RGN (5–9 axles)
• Permit required: Oversize and overweight permits required; escort vehicles required for widths over 12 ft

Key Transport Challenges for Cold Planers

Width: The Primary Challenge

The milling drum housing on full-lane machines extends significantly beyond the machine's body width. In transport position, the drum is typically retracted, but the housing may still be 10–14 feet wide. This is the primary dimension that triggers oversize permits and escort requirements. Always measure the machine's width at its widest point (including the drum housing) in transport position before booking transport.

Weight Distribution

Cold planers are front-heavy machines — the milling drum and its drive system concentrate significant weight at the front of the machine. This affects how the machine must be positioned on the trailer to achieve proper axle weight distribution. Experienced heavy-haul drivers know to position the machine with the drum end toward the front of the trailer (toward the tractor) to balance the load.

Ground Clearance for Loading

Cold planers have very low ground clearance when the drum is in the lowered position. Before loading, the drum must be raised to its maximum transport height. Verify with the equipment operator that the drum raise mechanism is functional before the carrier arrives. Non-functional drum raise mechanisms require crane loading, which adds cost and complexity.

Permit Requirements by Machine Size

Machine Class	Width	Weight	Permit Type	Escorts
Compact (up to 4 ft cut)	6–8 ft	30,000–55,000 lbs	Usually none	None
Mid-size (4–7 ft cut)	8–10 ft	55,000–90,000 lbs	Overweight; oversize if >8.5 ft wide	None to 1 escort
Full-lane (7–14 ft cut)	10–14 ft	90,000–130,000 lbs	Oversize + overweight	1–2 escorts required

Loading and Securement

Proper loading of a cold planer requires:

1. Raise the milling drum to maximum transport height and lock in position.
2. Retract any side plates or conveyor extensions to minimum width.
3. Drive the machine onto the RGN trailer from the rear (gooseneck detached) under its own power, or use a crane if non-operational.
4. Position the machine with the drum end toward the tractor for proper weight distribution.
5. Secure with a minimum of four heavy-duty chains (rated for the machine's weight) at designated tie-down points on the machine frame.
6. Secure the drum in the raised position with additional chains or blocking to prevent lowering during transit.

Cost Factors for Cold Planer Transport

• Compact millers: $3.50–$6.00 per loaded mile on a step-deck or lowboy.
• Mid-size millers: $5.00–$8.00 per loaded mile on a multi-axle lowboy.
• Full-lane millers: $6.00–$10.00 per loaded mile on a multi-axle RGN, plus permit fees and escort costs.
• Permit fees: $100–$600 per state depending on load dimensions and weight.
• Escort vehicles: $2.50–$4.00 per mile per escort for full-lane machines.

IronHaul Logistics ships asphalt milling machines of all sizes nationwide, from compact half-lane units to full-lane machines requiring multi-axle RGN trailers and escort vehicles. Request a free quote at ironhaullogistics.com, call (208) 495-2260, or email [email protected].