I think it is fair to say that curtain siders have led to drivers often using either no “load restraints” or not enough, on the grounds of if you can’t see it it can’t hurt you.
I started driving in the days when all non-specialist trailers were flats and you could see what the load was doing all the time.
The sight of something appearing in your mirrors that was not there when you set off was enough to focus the mind on properly securing the load before you started.
Friction is what keeps a load on a trailer and when there is not enough, extra measures have to be taken.
What you use depends on the load.
When it is heavy lumps that can fall over, like cable reels, paper reels, machinery etc, chains or straps.
Bags or boxes on pallets, the pallets normally will not slide but the bags or boxes need to be kept upright, so ropes or straps.
Loads like this were undoubtedly more secure under properly used ropes and sheets than strapped inside a curtain sider.
What you secure the strap or chain to depends on what it is doing.
If the strap is doing the work of a rope, a rope hook is enough but if it’s holding down a machine, then a proper anchor point or right round the chassis is required.
Unfortunately, a classroom trained VOSA person is unlikely to be able to make this distinction.
I used to use a common sense guide when deciding what to use, if the “load restraint” was strong enough to be used to lift the load off, it would keep it on the trailer.
Similarly, if the “restraint” would break before the fixing point, you had chosen the right fixing point.
A chain is always most effective if wrapped round the chassis and on trailers where this is not possible, such as low loaders or step frames,there are sturdy anchor points built into the bed.
In my opinion, if every curtain sider was loaded as if it was a flat trailer and the curtains seen as no more than protection from the weather there would never have been the need for VOSA to “tighten up”.
Sometimes there is only so much that can be done.
I remember a report in “Headlight” years ago where a trailer load of railway wagon wheels had fallen off on a roundabout.
The driver was prosecuted for an insecure load but he won his case.
The wheels had been lined up front to back between two chocks nailed to the trailer floor and only the back one had a “load restraint”.
It was successfully argued that the vehicle had been overturning in a “slow rollover” and that the trailer had effectively tipped them off.
In other words, the load was not insecure, the trailer partially overturning had thrown them off.
A silly prosecution, really, a bit like prosecuting a tipper driver for spilling grain on the road because he has laid the trailer on its side.
Only gravity holds it in the trailer and even VOSA are unlikely to demand that every grain is individually secured.
Regards,
Nick