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Curtainsided Longer Semi-Trailer Open
Curtainsided Longer Semi-Trailer Closed

Longer Semi-Trailers (LSTs)

From 31st May 2023, Longer Semi Trailers (LSTs) can be operated without a trial VSO on UK roads.

Following more than a decade-long trial, a newly amended Road Vehicles (Authorisation of Special Types) (General) Order 2023 allows operators to run LSTs on pre-planned routes with some operational caveats.

News Article

Curtainsided Longer Semi-Trailer Closed

Why Longer Semi-Trailers?

Longer Semi-Trailers (LST's) are up to 2.050m longer than a standard 13.6m trailer and can carry 15% greater capacity than their standard length counterparts.

Well suited to light and medium freight operators, the additional cube will reduce delivery frequency, cut down on fuel costs and lower CO2 emissions.

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TK Maxx Wedge Longer Semi-Trailer


Don-Bur engineered their first 16m trailer in 1999 with an active rear steer system (SCM). Since the DfT announced the LST scheme in 2011 Don-Bur has manufactured numerous designs to suit requirements.

  • Straight & Step-Frames
  • Double Deck options
  • Variable 13.7m to 15.650m lengths
  • Self-tracking or positive steer rear axle
14.6m Or 15.65m

Up to 8 Additional UK Pallets (1200x1000mm) on Double Decks

Don-Bur's LST's can provide operators with an additional 4 UK pallet capacity on a 15.65m single deck and 8 UK pallet capacity on a 15.65m Double Deck.

This can potentially reduce your deliveries by up to 1 in every 6.5 trips.

Quick Guide To LST's

  • Up to 2.05m longer.
  • Tri-Axle
  • Steer axle at rear
  • Vehicles are still required to operate within the existing UK GVW of 44 tonnes.
Guide To Longer Semi-Trailers
Teardrop Longer Semi-Trailer

Teardrop Bodywork

The patented aerodynamic Teardrop technology is a mature and well-tested method to save fuel.

Find out more

3D Longer Semi Trailer

3D Interactive Model

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3D Launcher

longer semi-trailer blueprint

Key Dimensions

Between 13.6m and 15.65m long

Up to 4.95m high

2.55m wide (dry freight)

Total combination max length of 18.55m


15.395m long (curtain sided)

15.495m long (box van)

Weights & Capacities

30 UK pallets (1200 x 1000mm) per deck

38 Euro Pallets (1200 x 800 mm) per deck

44T Maximum Gross Vehicle Weight (Vehicles with 6 axles)

Up to 60 UK pallets (76 Euro pallets) on double decks


Don-Bur (Bodies & Trailers) Ltd

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+44(0)1782 599 666