Low-bed trailers are the backbone of heavy machinery transport in South Africa — but not all low-bed trailers are the same. Understanding the different types, how they differ in deck height, loading capacity, and loading method, helps you choose the right transport solution for your specific machinery move. This guide explains the key types of low-bed trailers used in South Africa and when each is the right choice.
What Is a Low-Bed Trailer?
A low-bed trailer — also called a lowboy trailer, machinery transport trailer, or equipment transport trailer — is a specialist road trailer designed to carry heavy and oversized loads. Its defining feature is its low deck height, typically ranging from 400mm to 1,200mm above the ground. This low platform reduces the total height of the loaded combination, allowing taller equipment to be transported within South Africa’s legal road height limits without requiring a special height dispensation.
Fixed Gooseneck vs. Removable Gooseneck Low-Bed Trailers
The gooseneck is the front section of the trailer that connects to the truck. Low-bed trailers with a fixed gooseneck have a permanently attached front section — loading is done from the rear ramps or by crane. Trailers with a detachable gooseneck allow the front section to be disconnected and lowered to the ground, creating a ramp at the front of the trailer. This makes it easier to drive wheeled and tracked equipment (such as excavators) directly onto the deck from the front. For heavy industrial machinery that must be crane-loaded, either type works — but a detachable gooseneck provides greater crane access flexibility.
Hydraulic Lowbed vs. Mechanical Lowbed Trailers
Hydraulic low-bed trailers use hydraulic suspension that can be raised or lowered, allowing the deck height to be adjusted. When loading, the deck can be lowered to reduce the height drop from crane to trailer, and raised to standard road height for transport. Mechanical low-bed trailers have a fixed deck height without this adjustability. For very heavy or height-sensitive loads, hydraulic trailers offer significant practical advantages — particularly for loads that are fragile in the transition from crane hook to trailer deck.
Multi-Axle vs. Standard Low-Bed Trailers
The number of axles on a low-bed trailer determines its maximum load capacity. Standard configurations with two or three rear axles are suitable for loads up to approximately 60 tonnes. For heavier loads, multi-axle trailers — with four, five, or more rear axle groups — distribute the weight across a greater number of wheels and allow heavier loads to be transported within legal axle mass limits. Abnormal loads that exceed standard axle limits require a permitted abnormal transport movement regardless of trailer configuration.
When to Use a Low-Bed Trailer vs. a Flatbed Trailer
A low-bed trailer should be used when the loaded combination’s height would exceed 4.3 metres on a standard flatbed trailer, when the load is heavy enough to require the weight distribution advantage of a low-bed multi-axle configuration, or when the load’s stability benefits from a lower centre of gravity during transport. Standard flatbed trailers are suitable for loads that are not height-sensitive and fall within standard axle weight limits.
Reef Rigging arranges appropriate low-bed transport as part of its end-to-end machinery moving service. Learn more about our machinery moving services or contact the team for a transport and rigging quote.
Frequently Asked Questions: Low-Bed Trailers in South Africa
What is the maximum legal height for a vehicle and load on South African roads?
The maximum legal height for a vehicle and load combination on South African roads is 4.3 metres without a special height permit. A low-bed trailer’s reduced deck height means that taller equipment can be transported within this limit that would not otherwise fit on a standard flatbed. For loads that exceed 4.3 metres in height even on a low-bed trailer, a route survey and special height dispensation from the relevant authority is required.
How much can a typical low-bed trailer carry in South Africa?
A standard two-axle low-bed trailer is typically rated for loads of 30 to 40 tonnes. Three-axle configurations can carry 45 to 60 tonnes. For heavier loads, multi-axle trailers or modular combinations can be configured to carry several hundred tonnes when permitted under abnormal load regulations. The applicable legal limit is determined by axle mass limits — the total load must be distributed across enough axles to keep individual axle loads within the limits specified in the Road Traffic Act.
What documents are required to transport machinery on a low-bed trailer in South Africa?
For a standard legal load, normal vehicle registration and roadworthiness certificates are required. If the load is classified as abnormal — exceeding standard width, height, length, or axle mass limits — an abnormal load permit from the relevant provincial road authority is required. The application must include route information, load dimensions, axle mass schedule, and the proposed movement date. For very large or heavy abnormal loads, additional requirements such as escort vehicles, traffic accommodation, and time-of-day restrictions may apply.