Lowboy Trailer

Lowboy Trailer

A Lowboy Trailer is an unpowered trailer which is commonly used to haul freight. These kinds of trailers are generally designed to carry and transport taller goods and items. This means that the items to be carried to a Lowboy Trailer are taller than the legal height of items that are commonly carried by flatbeds. Our expert advisors will indicate if you need state permits for your particular load or type of freight. Basically, a lowboy that has two axles can haul around 40,000 pounds. 

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The maximum weight and dimensions are as follows:

Lowboys Maximum weight is 40,000 pounds for a 2-axle Lowboy Trailer; additional weight of up to 80,000 pounds depending on the number of axles used (weight of the trailer and weight of the load added together).

Lowboys Maximum Dimensions:
Maximum Lowboy Well Length- 24 ft – 29.6 ft
Maximum Lowboy Well Height- 18 in – 24 in
Maximum Legal Width- 8.5 ft
Maximum Legal Freight Height- 11.5 ft – 12 ft
Maximum Legal Overall Load Height- 14 ft


The lowboy trailer comes in several types, for a wide range of tasks. Some types are:
  • Fixed gooseneck (FGN): allows a longer deck length and has the lightest weight. These are lower trailers than normal, with low-profile tires, usually with drop ramps in the rear to facilitate loading of equipment, but are not actually considered "lowboys". The neck is arched in such a way, that it when lowered, it becomes a ramp thus allowing the front tires of equipment to be pulled onto the deck.
  • Fixed-neck: the neck is fixed to trailers; offers the lightest weight, but sacrifices the ability to detach and load over the front.
  • Hydraulic detachable gooseneck (hydraulic RGN or HRGN)): fastest and easiest to detach, at the expense of weight and deck length. It is the most common and versatile of lowboy trailers; the gooseneck is detached using large hydraulic cylinders to raise and lower the trailer and a small cylinder shores the neck to the truck, removing the neck so a large piece of equipment can be driven over the front onto the deck of the trailer for transport. The hydraulics can be run from the truck auxiliary or from a pony motor mounted in the neck of the trailer.
  • Mechanically-detachable gooseneck (mechanical RGN or MRGN): while usually lighter than the hydraulic detachable gooseneck, users sacrifice ease and speed of detaching. Used for long specialty hauls.
  • Mechanical folding gooseneck (MFGN): The deck folds down to ground level to provide a ramp for from trailer loading.


Lowboy trailer features include:

1. Suspension types

 - Spring ride: lowest cost; however, it has a rougher ride and adds more stress to the trailer
 - Air-ride: very smooth ride, adding to the life of the trailer frame. Air rides can also be adjusted for a higher or lower deck height. - Hydraulic suspension: an oil-filled system, allowing wide variation of axle movement - Independent suspension: a double wishbone, hydraulic suspension, which offers more stability, greater steering angle and more travel

2. Structural types

 - Main structural steel type: mill rolled beams save money; although being around 4,000–6,000 lb (1,814–2,722 kg) heavier, they also reverse camber after a few years due to the much-lower strength of the main beams.

 - T1 or A514 beams save weight and allow more versatile engineering of the trailer; they are cut to the highest-strength shape possible and welded together.