The Removable Gooseneck trailer — universally known as an RGN — is the essential equipment for moving heavy, self-propelled construction and industrial equipment over the road. The defining feature is the detachable front gooseneck: by disconnecting the tractor and detaching the gooseneck from the main deck, the entire trailer bed can be lowered to or near ground level, creating a ramp that allows tracked and wheeled equipment to drive directly onto the deck under its own power. This drive-on capability solves the fundamental problem with double drop and step deck trailers for equipment like excavators, bulldozers, and motor graders: those machines cannot be easily lifted by crane at every origin and destination. With an RGN, the equipment operator drives the machine onto the deck, the gooseneck is reattached, and the tractor backs under and connects. No crane needed. The well deck on an RGN sits at the same low height as a double drop (approximately 18–24 inches above the road surface when loaded), providing similar height clearance benefits — cargo up to about 11.5 ft tall can typically be transported without an oversize height permit. For very tall loads, multi-axle "lowboy" configurations and hydraulic suspension systems can further reduce deck height. Payload capacity is where RGN truly differentiates: while a standard 3-axle RGN handles up to roughly 40,000–50,000 lb on the deck, multi-axle configurations (5, 7, 9, or even 20 axles for the heaviest industrial superloads) can legally carry 100,000 lb or more with appropriate permits. Heavy haul carriers specializing in RGN moves have engineering teams dedicated to axle load calculations and permit applications. Permitting is an almost universal requirement for RGN loads. Most construction equipment loads exceed the 80,000 lb federal gross weight limit. Permit applications must be filed with every state along the route, often with route surveys and bridge analysis included.
| Typical length | 48–53 ft overall; well deck approximately 25–29 ft (extendable models available) |
| Typical width | 8.5 ft (102 in) standard; overwidth loads require permits |
| Typical height | Well deck 18–24 in above ground when loaded; detached gooseneck allows deck to rest at grade for drive-on/off loading |
| Payload capacity | 40,000–150,000+ lb depending on axle configuration (standard 3-axle RGN to 20-axle specialized configurations for extreme heavy haul) |
New RGN trailers vary widely — a standard 3-axle RGN may cost $80,000–$150,000; multi-axle and hydraulic-detach configurations can exceed $500,000. Per-move costs include trailer, permits, pilot cars, and often route surveys — total move costs are project-quoted, not per-mile rated.
The gooseneck is the curved front section that connects the trailer deck to the tractor's fifth wheel. On an RGN, this section physically detaches from the deck. When detached, the front of the deck can lower to ground level, forming a ramp. This allows self-propelled equipment (excavators, dozers) to drive directly onto the trailer without a crane — which is the defining advantage over double drop and step deck trailers.
These terms are sometimes used interchangeably, but they have a technical distinction. A lowboy is any trailer with a lowered center deck (including fixed-gooseneck versions). An RGN specifically refers to a lowboy with a removable/detachable gooseneck that enables drive-on loading. All RGNs are lowboys, but not all lowboys are RGNs.
It varies significantly by route and load. Single-state moves at or near legal weight limits may be permitted same-day or next-day online. Multi-state routes with loads exceeding individual state's superload thresholds can require 1–3 weeks or more, including route surveys and state DOT review. Begin permit applications as early as possible for time-sensitive project equipment moves.
Federal bridge law (23 USC 127) limits axle group weights, not just gross weight. A standard 5-axle combination is limited to 80,000 lb gross. Moving 100,000 lb legally requires additional axle groups — typically a 7- or 9-axle configuration with state overweight permits. The specific configuration depends on axle spacing and state-by-state regulations along the route.
Not always. Pilot car requirements are triggered by width, height, length, or weight thresholds that vary by state. Many equipment loads on a standard RGN will require at least a rear pilot vehicle. Very wide or very heavy loads require front and rear pilots, and some states require law enforcement escorts for loads exceeding certain dimensions or weights. The permit office for each state traversed specifies escort requirements.