Faqs / Product Knowledge
What are the EU classification of vehicle types?
In Europe, vehicles are classified according to UN ECE Standards
What is a Raise/Lower Valve?
Discover the Raise/Lower Valve on HGV trailers - your key to adaptable heights, stable transportation, and efficient loading. Uncover the secrets behind this hydraulic marvel now!
What sort of panels do you use / sell?
Don-Bur uses and sells a variety of panels depending on suitability, recyclability, weight and cost.
What is "flap and valance"?
Flap and valance is a type of spray suppression system used typically in lieu of mudlflaps.
How many pallets can I fit onto a trailer?
The capacity and pallet footprint of any trailer depends on many factors. On this page, we highlight the different trailer types and the expected capacity.
What is a "De-Mount" or "Demountable Bodywork"?
A De-Mount is a type of special body which attaches temporarily to a rigid truck chassis but can be dropped at any location and stands on four legs.
What are HGV Trailer Couplings?
Trailer couplings refer to both the electrical and pneumatic lines that span between, and connect, the tractor unit and trailer.
What are "Barn Doors"?
The term "barn doors" is a widely used colloquial expression for rear doors that have the locking bar mechanism on the outside of the door.
What are "Nappy" and "Kite" Load Restraint Systems?
In the context of cargo securement, the terms "nappy" and "kite" refer to types of transverse load restraint systems, also known as cross straps or tie-downs.
Got Questions about Bogies? We've Got Answers
A bogie, also known as a wheelset, is a modular subassembly of wheels and axles used to support and guide a vehicle along a track or surface.
What is a pelmet?
A pelmet is a rubberised flap that forms a weather seal between the roof rail and curtain on curtainsider bodies.
What is a Box Van?
Box Van is a term used for solid sided (panelled) bodies and trailers. This can be shortened to just vans although it does not relate to what the public would think of a van.
What is an "under-run" or "underrun"?
An underrun, also known as a rear underride guard or bumper, is a structural reinforcement mounted at the rear of a trailer or rigid body vehicle.
What is a "Moffett"?
The term "Moffett" is a widely used abbreviation for a truck-mounted forklift, also known as a vehicle-mounted forklift (VMF) or lorry loader.
What is "MHE": Materials Handling Equipment?
MHE stands for materials handling equipment. It is a broad term for a wide range of equipment used to move, store, and control materials and products.
What is a "PPT" / "LLOP"?
What is a PPT: Powered Pallet Truck?A powered pallet truck (PPT), also known as an electric pallet truck or walkie stacker, is a material handling equipment
What is "traction" in the HGV industry?
In the HGV industry, the term "traction" is informally used to refer to a tractor unit pulling a trailer.
What is a "Rigid"?
A rigid HGV (Heavy Goods Vehicle) is a large, non-articulated truck where the cargo-carrying body is permanently attached to the chassis.
What is a "shunter" or "tug"?
A tug, or shunter, is a powerful vehicle that is used to move railroad cars and other large vehicles around a railyard or industrial facility.
What is a "Draw-Bar" or "Drawbar"?
A Draw-Bar is an HGV combination which comprises a rigid truck body (The Prime Mover) and another specialised trailer (Draw-Bar trailer).
How do I calculate axle weights?
Don-Bur provides a free online tool that allows you to approximate the load on the axle set (bogie) with varying load types and weights.
What is a step-frame, swan-neck or goose-neck?
The swan-neck (or goose-neck) is a section of a trailer chassis where the height drops from a first level (to suit the fifth wheel height) to a second, lower level. These types of chassis are known as Step-Frames.
What is the bed plate / rubbing plate?
The bed plate (or rubbing plate) is a heavy duty horizontal plate on the underside of the front of the trailer which is designed to sit and slide on top of the tractor fifth wheel. It houses the kingpin.
What is a Side Rave?
The side raves of a trailer are the outer side edges of the main trailer chassis.
What are "Landing Legs"?
Landing Legs are a pair of heavy duty support legs, located behind the bed plate, which support the weight of the front of the trailer when the trailer is uncoupled.
What is a Kingpin?
A Kingpin is a heavy duty attachment pin that extends below the trailer bed plate. During coupling, this locks into the tractor unit fifth wheel.
What are "Suzies"?
"Suzies" refer to the coiled lines between the tractor unit and trailer. This Unipart copywrite term originates back to the "Suzie" Slinky toys and is in common use in the industry.
How can I tell what size a tyre is?
Tyre size, load index and speed rating are defined by a number of variables which are displayed on the tyre label. We explain what these mean.
What is "TIR"?
TIR stands for Transports Internationaux Routiers and is the only internationally accepted transit system.
What Is Split Coupling?
Split coupling is the frowned-upon practice of reversing the tractor fifth wheel under the trailer bed plate just enough to support the trailer but not enough to couple positively with the trailer kingpin.
How tall are double deck trailers?
Don-Bur extends trailer height to 4.95m. UK allows unlimited height, but bridges usually clear 5.0292m. Double deckers maintain ~4" (101.6mm) for suspension "bump & roll."
What Is An Expected Trailer Lifespan?
Trailers have 3 cycles: 10-12 years primary life, maintenance costs rise post that. Anticipated breakdown or repurposing after 20-22 years.
What is a fifth wheel?
A fifth wheel is the horizontal coupling plate on a tractor unit which slides underneath the trailer bed plate during coupling. It has jaws which clamp onto the kingpin.
What is an ECU?
Trailer ECU (Electronic Control Unit) powers via ISO 7638 from the tractor unit, managing braking and suspension.
What sort of tail-lifts (tail lifts) are there?
Tail-lift types: Tuckaway folds under chassis. Column has standard and two-tier options. Retractable slides from rear, needs space. Cantilever is a large platform stowing as rear closure, rotating for use. Explore more in our Feature Library.
What is EN 12195?
EN 12195: European standard for commercial vehicle load restraint. Calculate strap strength and set testing standards for secure loads.
What is EBPMS?
EBPMS stands for Electric Braking Performance Monitoring System and is a system to continually monitor how effective the brakes are at any given time.
What are the different types of landing leg feet?
Landing leg foot types: Wheeled, Flat, and Compensating Rocker. Explore options for stable and adaptable support.
How does a hydraulic double deck work?
Don-Bur's 'Lifting Decks,' evolving since the late '80s, use hydraulic rams and cables for precise lifting. Electric-powered and resistant to jamming.
What is an ISO 7638 Connection?
ISO 7638: Vital 7-pin electrical trailer coupling powering ECU, enabling fast braking, load sensing, and roll stability. Legally required since May 2002.
What is RSP or RSS?
RSP/RSS in new braking systems prevents rollovers. Knorr-Bremse feature reacts to lateral acceleration, tests wheel state, and controls oscillations for stability.
What is Trailer Rollaway?
Prevent trailer rollaway risks! Learn why applying park brakes is crucial. Don-Bur's infographic explains trailer air brakes to enhance safety during coupling. Follow proper procedures
What is Vehicle Type Approval?
Ensure vehicle compliance with Type Approval. 'E' marks and Certificates of Conformity validate standards. VCA oversees EU WVTA, NSSTA, and IVA in the UK.
What is the difference between C type and Palm type couplings?
Air line connections: C couplings in the UK. Palm couplings in Europe. Adapters may be needed for UK-EU tractor-trailer connections.
What is EN 12640?
BS EN 12640 sets standards for commercial vehicle lashing points. Ensure compliance with design, construction, and positioning criteria for secure goods transport.