RGN vs. Lowboy Trailer: Key Differences and How to Choose
If you've ever gotten a quote for heavy equipment transport, you've probably seen the terms 'RGN' and 'lowboy' used—sometimes interchangeably, sometimes as if they're different things. The confusion is understandable: both are low-deck trailers used for tall or heavy equipment, and the terms overlap in common usage. But there are real differences that matter when you're choosing the right trailer for your machine.
What Is a Lowboy Trailer?
A lowboy trailer (also called a low-bed or low-loader) is any trailer with a deck that sits significantly lower than a standard flatbed. The defining characteristic is the low deck height—typically 18 to 24 inches off the ground—which provides additional vertical clearance for tall equipment. Lowboy trailers achieve this low deck by using a "well" or "drop" in the trailer frame between the front and rear axle groups.
Lowboy trailers come in several configurations:
- Fixed-neck lowboy: The gooseneck (the angled section connecting the trailer to the truck's fifth wheel) is permanently attached. Equipment must be loaded from the rear using ramps, or lifted on by crane. This is the most common configuration for lighter lowboys (under 40 tons).
- Detachable gooseneck (RGN): The gooseneck detaches from the trailer, allowing the front of the trailer to drop to the ground. Equipment can be driven directly onto the trailer from the front. This is the defining feature of an RGN trailer.
- Hydraulic detachable gooseneck (HRGN): A hydraulically operated version of the RGN that allows faster and more precise gooseneck removal and reattachment.
What Is an RGN Trailer?
An RGN (Removable Gooseneck) trailer is a specific type of lowboy trailer where the gooseneck section can be physically detached from the trailer deck. When the gooseneck is removed, the front of the trailer drops to the ground, creating a ramp that allows equipment to be driven directly onto the trailer under its own power.
This is the key advantage of an RGN over a fixed-neck lowboy: equipment can be driven on and off without a crane or external loading equipment. For operational machines (excavators, wheel loaders, dozers, motor graders), this dramatically simplifies loading and reduces cost.
RGN trailers are available in a wide range of capacities:
- Standard RGN: 40–55 ton capacity; 2–3 axles; most common for construction equipment
- Heavy RGN: 55–80 ton capacity; 3–4 axles; used for large excavators, large cranes, and heavy mining equipment
- Multi-axle RGN with jeep and booster: 80–150+ ton capacity; used for superloads and very heavy mining equipment
RGN vs. Lowboy: Key Differences
| Feature | Fixed-Neck Lowboy | RGN (Detachable Gooseneck) |
|---|---|---|
| Loading method | Rear ramps or crane only | Drive-on from front (or rear ramps) |
| Deck height | 18–24 inches | 18–24 inches (same when loaded) |
| Equipment must be operational? | No — crane loading works for non-op | Preferred for operational machines; non-op can be crane-loaded |
| Loading time | Longer (ramp setup or crane) | Faster (drive-on in minutes) |
| Cost | Generally lower for lighter loads | Generally higher due to more complex trailer |
| Best for | Non-operational equipment; lighter loads; rear-loading situations | Operational equipment; faster loading; most construction equipment |
When to Use an RGN
Choose an RGN trailer when:
- Your equipment is operational and can be driven onto the trailer under its own power
- You need the fastest possible loading time (auction pickups, tight schedules)
- Your equipment is too tall for a flatbed or step-deck (over 10–11 ft in transport position)
- Your equipment weighs more than 40,000 lbs and needs a low deck for height compliance
- You're shipping a large excavator, wheel loader, dozer, motor grader, or similar machine
When to Use a Fixed-Neck Lowboy
Choose a fixed-neck lowboy when:
- Your equipment is non-operational and will be crane-loaded
- The equipment's loading geometry makes rear-ramp loading more practical than front drive-on
- You're shipping a lighter load (under 40 tons) where a fixed-neck lowboy is more cost-effective
- The pickup or delivery site has limited space for the gooseneck removal process
The "Lowboy" Confusion in Common Usage
In everyday heavy-haul conversation, "lowboy" is often used as a generic term for any low-deck trailer—including RGNs. When a carrier says "we'll put it on a lowboy," they may mean either a fixed-neck lowboy or an RGN. If the loading method matters for your situation (for example, if your machine is operational and you want drive-on loading), ask specifically whether the trailer has a removable gooseneck.
Get the Right Trailer from IronHaul Logistics
IronHaul Logistics operates both fixed-neck lowboys and RGN trailers across our carrier network. When you request a quote, we'll confirm your equipment's dimensions and operational status and recommend the right trailer configuration for your specific move. To get a free quote, fill out our online form, call (208) 495-2260, or email [email protected].
Common questions
What is the difference between an RGN and a lowboy trailer?
A lowboy is any trailer with a low deck (18–24 inches off the ground). An RGN (Removable Gooseneck) is a specific type of lowboy where the gooseneck section detaches, allowing equipment to be driven directly onto the trailer from the front. Fixed-neck lowboys require rear ramps or crane loading. Both have the same low deck height when loaded.
When should I use an RGN trailer instead of a lowboy?
Use an RGN when your equipment is operational and can be driven onto the trailer under its own power. RGNs load faster than fixed-neck lowboys and are the standard choice for excavators, wheel loaders, dozers, and motor graders. Fixed-neck lowboys are better for non-operational equipment or situations where rear-ramp loading is more practical.
What is the weight capacity of an RGN trailer?
Standard RGN trailers handle 40–55 tons. Heavy RGNs handle 55–80 tons. Multi-axle RGN configurations with jeep and booster axles can handle 80–150+ tons. The right configuration depends on your equipment's weight and the axle weight limits on your route.
What is the deck height of a lowboy or RGN trailer?
Both fixed-neck lowboys and RGN trailers have deck heights of approximately 18–24 inches off the ground when loaded. This is significantly lower than a flatbed (48–60 inches) or step-deck (36–48 inches), providing additional vertical clearance for tall equipment.
Does IronHaul Logistics have RGN trailers available?
Yes. IronHaul Logistics operates both fixed-neck lowboys and RGN trailers across our carrier network. We'll recommend the right trailer configuration based on your equipment's dimensions, weight, and operational status. Contact us for a free quote.
Ready to move a machine?
Tell us what you're shipping and where. We quote direct — no bidding wars, no load-board runaround.