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Box Van Lifting Deck Longer Semi-Trailer in showroom

Longer Semi Trailers (LSTs) | Up to 8 More Pallets


What Are Longer Semi-Trailers?

Longer Semi-Trailers (LST's), now legal to use on UK roads, are up to 2.050m longer than a standard 13.6m trailer (up to 15.65m) and can carry up to 60 UK pallets (15% greater volume) than their standard length counterparts.

A tractor unit coupled to an LST must not exceed a length of 18.55m in total.

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

From 31st May 2023, Longer Semi Trailers (LSTs) can be operated on UK roads

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.

The Longer Semi-Trailer trial, which ran from January 2012, ended on 29th February 2024.

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Engineered to perform consistently in demanding environments

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365/7/24 hr after sales service

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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

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

Don-Bur's Longer Semi Trailers 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.

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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

Published: Tue 23 Jan 2024

Updated: Fri 24 May 2024

Don-Bur (Bodies & Trailers) Ltd

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