How to Ship a Large Industrial Generator: Trailer Types, Permits & Costs

Generator Size and Weight Ranges

Industrial generators span an enormous range of sizes. Trailer-mounted standby generators (100–500 kW) typically weigh 5,000 to 20,000 lbs and are often already on wheeled skids, making transport relatively straightforward. Mid-size generators (500 kW to 2 MW) in enclosures weigh 20,000 to 60,000 lbs and measure 15 to 30 ft long, 8 to 10 ft wide, and 8 to 12 ft tall. Large prime power generators (2 MW+) can weigh 80,000 to 200,000+ lbs and require superload permits and specialized multi-axle trailers.

The enclosure or housing adds significant width and height — many generator sets in weatherproof enclosures exceed 8.5 ft wide and 13.5 ft tall, triggering oversize permits even for mid-size units. Always measure the generator with its enclosure, skid, and any attached fuel tanks before requesting a quote.

Trailer Selection

• Flatbed Trailer: Suitable for smaller generators (under 48,000 lbs) that fit within standard legal dimensions. Crane or forklift loading is required since generators cannot be driven on.
• Step Deck Trailer: Provides additional height clearance for generators in tall enclosures. The lower deck height (34–38 inches) helps keep the overall load height under 13.5 ft.
• Lowboy / RGN Trailer: Required for large generators exceeding standard height or weight limits. Deck heights as low as 22 inches provide maximum clearance margin for tall units. Multi-axle configurations handle 80,000 to 150,000+ lbs.
• Multi-Axle Specialized Trailer: Required for superload generators (over 120,000 lbs or extreme dimensions). These moves require engineering route surveys and special permits in every state.

Pre-Transport Preparation

Generator transport requires more preparation than most equipment due to fluid and electrical considerations:

• Drain all fluids: Engine oil, coolant, and fuel must be completely drained before transport. This is a DOT requirement for hazardous materials compliance and prevents leaks during transit. Retain a certified drain receipt for documentation.
• Disconnect and secure electrical connections: Disconnect all external power connections and secure loose wiring harnesses to prevent damage.
• Protect the control panel: Brace or pad the control panel and any exposed instrumentation. Use weatherproof covers if the generator will be exposed to the elements during transport.
• Secure the enclosure: Verify that all enclosure doors and panels are latched and locked. Tape or brace any panels that may vibrate loose during transit.
• Document condition: Photograph the generator from all four sides and document all existing damage before loading.

Loading Requirements

Industrial generators cannot be driven onto trailers — they require crane, hydraulic gantry, or heavy forklift loading. The lifting points on the generator skid or frame must be rated for the machine's weight. IronHaul coordinates loading equipment at pickup and delivery locations and verifies that site access is adequate for the crane or forklift required.

Permit Requirements

Generators in enclosures frequently exceed 8.5 ft wide and 13.5 ft tall, requiring oversize permits in every state on the route. Large generators over 80,000 lbs GVW require overweight permits as well. Superload generators (over 120,000 lbs or extreme dimensions) require engineering route surveys, bridge analysis, and special permits that can take 2 to 4 weeks to process. Plan accordingly for large generator moves.

Cost Factors

Generator transport costs vary widely based on size, weight, and route. Small to mid-size generators on flatbeds or step decks typically run $2.00 to $4.00 per loaded mile. Large generators on lowboys with oversize permits run $3.00 to $6.00 per loaded mile. Crane rental for loading and unloading adds $500 to $2,000 per lift depending on crane size and location. Superload moves with engineering surveys and special permits can add $5,000 to $20,000 in additional costs.

Need to move an industrial generator? IronHaul Logistics coordinates generator transport nationwide, including crane coordination, fluid drain documentation, and permit management. Call (208) 495-2260, email [email protected], or submit your generator's dimensions and weight through our online quote form.