For a UK loading-bay operator, the first dock-restraint question is whether the proposed system is compatible with the vehicles that actually arrive. Price and automation matter after that fit has been established. A restraint selected from a product photograph or a generic capacity claim is an incomplete purchasing decision.
This comparison focuses on wheel-based options documented for the UK market. It provides a way to prepare a supplier survey and compare proposals; it does not establish that any one model is suitable for every trailer or loading bay.
What the supplier documentation establishes
- Stertil COMBILOK — Published description: Stertil describes a wheel restraint with integrated vehicle guides, visual and acoustic signals, and controls that can be integrated with dock equipment. [1]; Site-specific question: Which visiting vehicle configurations can it engage, and what installed footprint and control arrangement are proposed?
- Loading Systems 505NG — Published description: Loading Systems describes an automatic rear-wheel restraint and sequence control involving the restraint, dock door and leveller. [2]; Site-specific question: How will the proposed installation establish and indicate the required equipment states?
- Loading Systems 503NG — Published description: The manufacturer presents this as a manual vehicle-restraint option. [2]; Site-specific question: Does its operating arrangement fit the site’s staffing, communication and vehicle mix?
Automatic and manual options involve different operating arrangements. The table is not evidence of comparative incident reduction, and the presence of a restraint does not establish the safety of the whole loading operation.
Build a fleet compatibility schedule
Prepare a record of representative visiting vehicles, including recurring exceptions. Ask the supplier to confirm the relevant wheel and tyre dimensions, axle positions, clearances and vehicle features needed for its design. Where the supplier requires measurements, have them gathered through an appropriate site survey.
Include seasonal fleets and third-party hauliers, rather than checking only company-owned trailers. The useful deliverable is a written compatibility schedule naming the accepted configurations, excluded configurations and any conditions attached to acceptance.
For a vehicle outside that schedule, the site needs a separately assessed loading arrangement. Do not assume that a different restraint type or an improvised adaptation makes the vehicle compatible.
Assess the bay and the existing controls together
Give the supplier information about the approach, yard surface, drainage, dock geometry, traffic movements and existing door and leveller controls. Ask who is responsible for civil works, electrical work, integration and commissioning, with exclusions stated in the quote.
Request a control narrative explaining what operators and drivers see at each stage, how conflicting signals are avoided and how faults are reported. Exception and recovery procedures should come from the approved site arrangement and equipment instructions, with named responsibility for decisions.
HSE’s loading and unloading guidance addresses wider arrangements such as keeping unnecessary people clear of the loading area and cooperation between the parties involved. These remain part of the site assessment alongside the restraint selection. The guidance is not a certification of any product in this shortlist. [3]
Compare complete proposals
- Vehicle fit — Evidence to request: Compatibility schedule based on the site’s visiting fleet.
- Installation scope — Evidence to request: Survey findings, required works, responsibilities and planned downtime.
- Control integration — Evidence to request: Documented interfaces, signals, fault handling and commissioning checks.
- Handover — Evidence to request: Equipment documentation, training scope and named site responsibilities.
- Support — Evidence to request: Inspection and maintenance requirements, parts availability and a written service offer.
- Commercial terms — Evidence to request: GBP price, VAT basis, installation exclusions and recurring costs.
A lower equipment-only quote can become a higher project cost if civil works, controls or access arrangements are omitted. Compare the installed and supported system over the same period, using supplier figures instead of assumed maintenance or downtime savings.
When is a proposal ready to order?
Progress the proposal when compatibility, installation responsibilities, control behaviour and commissioning evidence are clear. Resolve excluded vehicles and exceptional operating conditions before procurement. The most useful shortlist is the one that produces an auditable design for the actual site, rather than the longest list of restraint brands.
References
- Stertil Dock Products UK — COMBILOK vehicle restraint (stertil-dockproducts.co.uk)
- Loading Systems UK — Vehicle restraint systems (loading-systems.com)
- Health and Safety Executive — Loading and unloading (hse.gov.uk)
