A lowboy trailer carries tall and heavy equipment on a very low deck. An RGN trailer, or removable gooseneck trailer, belongs to the lowboy family, but it has a detachable front neck. That neck turns the front of the trailer into a ramp. Choose a standard lowboy when you can load from the side, rear, or top. Choose an RGN when you need to drive, pull, or winch equipment onto the deck from the front.
Both trailers move bulldozers, excavators, paving machines, cranes, farm equipment, industrial machinery, and other oversized loads. The main differences are loading style, cost, axle setup, and cargo access.
What is a lowboy trailer?
A lowboy trailer has a dropped deck that sits much lower than a standard flatbed. This low deck helps carriers move taller machines while staying within legal height rules.
Most lowboy wells measure about 24 to 29.6 feet long. Many lowboy deck heights sit around 18 to 24 inches above the road, depending on the trailer, tires, suspension, and load. A two-axle lowboy often handles about 40,000 pounds. Extra axles can raise capacity, with some setups reaching around 80,000 pounds.
A standard lowboy often works best for loads that crews can place using a crane, forklift, rear ramp, or side-loading method. It can cost less than an RGN because it has fewer moving parts.
If your freight does not require a removable neck, flatbed trailers may offer a simpler, more cost-effective hauling option.
What is an RGN trailer?
An RGN trailer means a removable gooseneck trailer. It also uses a low deck, but its front gooseneck detaches from the trailer. Once the driver removes the neck, the front of the deck sits near the ground. That creates a front loading path.
This design helps operators drive heavy machines straight onto the trailer. It also helps with broken equipment that needs a winch. Hale lists a common RGN setup as a tandem axle trailer with a 29-foot well. Some heavy haul RGN setups can add many axles and support far heavier loads, depending on state permits and configuration.
If you need front-loading flexibility for heavy equipment, browse INTERSTATE 365’s RGN trailers for sale and compare available removable gooseneck options.
RGNs cost more than basic fixed-neck lowboys. They also need more setup time. Choose one when front-loading speed and flexibility matter more than added cost.
Lowboy vs RGN comparison table
| Feature | Standard lowboy trailer | RGN trailer |
| Main purpose | Tall, heavy freight | Tall, heavy freight that needs front loading |
| Neck design | Fixed neck or fixed gooseneck | Removable gooseneck |
| Loading method | Side, rear, crane, forklift, or ramps | Front loading by driving, pulling, or winching |
| Typical well length | About 24 to 29.6 ft | Often around 29 ft |
| Typical deck height | About 18 to 24 in | Similar low deck height |
| Common capacity | About 40,000 lb on 2 axles | About 40,000 lb on basic tandem setups |
| Higher-capacity options | Extra axles can raise capacity | Multi-axle setups can handle much heavier freight |
| Best cargo examples | Generators, machines, non-running equipment, compact heavy loads | Excavators, dozers, pavers, combines, cranes, towable machinery |
| Loading equipment needed | Often yes | Often no, if the machine can roll or drive |
| Cost | Usually lower | Usually higher |
| Best choice when | Budget matters and loading access exists | Fast front loading matters |
Quick answer: Which trailer should you choose?
Choose a lowboy when the load does not need front loading. Choose an RGN when the load can be driven, rolled, or winched onto the trailer from the front.
The right trailer depends on five things:
- Load height
- Load weight
- Loading method
- Route permits
- Budget
An RGN gives you more loading flexibility. A fixed-neck lowboy offers a simpler, often cheaper setup.
Carriers that compare lowboys, RGNs, flatbeds, and step decks can also review INTERSTATE 365’s full selection of flatbed and step deck trailers for sale.
Why deck height matters
Deck height matters because states limit overall vehicle height. The Federal Highway Administration says the U.S. has no single federal vehicle height rule for commercial motor vehicles. States set their own limits, and most height limits range from 13 feet 6 inches to 14 feet.
A lower deck provides taller machines with more clearance. That can reduce permit problems on some routes. It can also help carriers avoid low bridges, wires, and route restrictions.
For example, a 9-foot-tall machine may exceed legal height on a flatbed. The same machine may fit on a lowboy or RGN because the deck sits much closer to the ground.
Why width and weight still matter
A low deck does not remove all permit needs. It only helps with height.
Federal rules set a 102-inch width limit on the National Network. That equals 8 feet 6 inches. States can issue permits for vehicles and loads that exceed that width.
Weight also needs careful planning. Federal rules list 80,000 pounds as the maximum gross vehicle weight on the Interstate System, unless the bridge formula sets a lower limit. They also list 20,000 pounds for a single axle and 34,000 pounds for tandem axles.
This means a trailer can have enough deck strength but still need permits. Axle spacing, axle count, bridge laws, tire rating, and route rules all affect the final legal move.
When does a lowboy make more sense?
A lowboy makes more sense when you need a strong, low deck and do not need front loading. Choose it when simplicity and lower cost matter more than loading flexibility.
Use a standard lowboy for:
- Heavy machines that crews can crane onto the deck
- Equipment that fits the well length
- Loads with simple pickup and delivery sites
- Jobs where cost matters more than loading speed
- Cargo that does not roll, drive, or need a shallow loading angle
A fixed-neck lowboy has fewer hydraulic parts. That can lower maintenance needs. It can also increase payload in some cases because the trailer carries less neck hardware.
When does an RGN make more sense?
An RGN makes more sense when the machine can move onto the trailer from the front. Choose it when front access will make loading faster or possible.
Use an RGN for:
- Bulldozers
- Excavators
- Pavers
- Wheel loaders
- Cranes
- Farm combines
- Motor coaches
- Disabled trucks or large vehicles
- Job sites with limited loading equipment
The removable neck gives the driver a built-in loading path. This can save crane costs. It can also help in rural, construction, mining, and agricultural areas where crews may not have loading docks or large forklifts.
Hydraulic RGN vs mechanical RGN
Many RGN buyers also need to choose between hydraulic and mechanical necks.
A hydraulic RGN works better for frequent loading. It lets the driver detach and reconnect the neck faster. It also reduces manual labor. However, the tractor usually requires a wet kit or an alternative hydraulic power source.
For longer equipment or oversized freight, hydraulic detachable extendable trailers can give carriers more deck length and easier front loading.
A mechanical RGN costs less and weighs less in many setups. It can work well for fleets that load less often. But it usually needs more time and effort during loading.
Main industries that use lowboy and RGN trailers
Construction
Construction companies use lowboys and RGNs for dozers, excavators, rollers, loaders, and paving machines. RGNs often work better when the equipment can drive onto the deck.
Agriculture
Farm operators and heavy-haul fleets use RGNs to transport combines, tractors, sprayers, and other large machines. Wide tires, long wheelbases, and uneven pickup sites often make front loading useful.
Oil, gas, and mining
These industries move drills, pumps, generators, compressors, and site equipment. Heavy loads often need extra axles, strong decks, and route planning.
Towing and recovery
Heavy recovery fleets use RGNs for disabled buses, trucks, and machines. The front loading angle helps crews winch large vehicles onto the deck.
Common mistake: Thinking an RGN always avoids permits
An RGN can reduce height problems, but it does not guarantee a permit-free move. Width, gross weight, axle weight, route, travel time, and state rules still matter.
The FHWA states that the federal government does not issue oversize or overweight permits. States handle those permits. Carriers must contact each state where the load will travel.
So the smart move starts with measurements. Before choosing a trailer, confirm:
- Machine height
- Machine width
- Machine weight
- Ground clearance
- Wheelbase or track length
- Tie-down points
- Pickup and delivery access
- Route restrictions
For broader buying guidance, read this guide to choosing a flatbed trailer for heavy loads before matching a trailer to your freight.
Final answer: Lowboy or RGN?
Choose a lowboy when you need a low deck, strong capacity, and lower cost. Choose an RGN when you need front-loading and easier access to equipment.
For many heavy-haul jobs, the RGN offers the greatest loading flexibility. For simpler loads, a fixed-neck lowboy may give you the same low deck at a better price.
The best trailer depends on the load, not the name. Measure the machine first. Then match the deck height, well length, axle setup, and loading method to the job.
FAQ
Is an RGN the same as a lowboy?
An RGN belongs to the lowboy trailer family, but it has a removable front gooseneck. That design allows front loading.
What is the biggest difference between a lowboy and an RGN?
The biggest difference is loading access. A standard lowboy usually loads from the side, rear, or top. An RGN loads from the front after the driver removes the gooseneck.
Which trailer works better for bulldozers?
An RGN usually works better for bulldozers because the machine can drive onto the front of the trailer.
Which trailer costs less?
A fixed-neck lowboy usually costs less than an RGN. RGNs have more parts, more functions, and higher loading flexibility.
Does an RGN remove the need for permits?
No. An RGN can help with height clearance, but width, weight, axle limits, and state route rules can still require permits.
What should I check before renting or buying one?
Check load weight, height, width, well length, loading method, axle requirements, route permits, and pickup site access.
