Trailer interior. Some are boarded like this, others we saw were plywood. There may be fewer uprights in place, the guy we spoke to said that there would usually be at least two because it helps support the roof. If our trailer has all the uprights in place they could leave a single board along each side to act as a low barrier to stop things rolling off and to act as an attachment point for anything that we want to hang down.

This trailer has a sliding roof, which is translucent. It means that there are bars across each section that can be used to hang fairly lightweight stuff. Other trailers have solid roofs, which may or may not be translucent. With these there might be a single bar running along the length, but there might be nothing.

Dimensions of the trailer:

Height: 250cm
Length: 1350cm
Width: 248cm maximum. In this trailer it was 237cm of wood floor, with metal around. This may vary slightly.

All the trailers are basically the same size, but there may be slight variations in all dimensions.

Wheels are all the same size. 105cm Diameter, with 59cm diameter hubs. All the trailers we saw had six wheels. Most of them had holes in the wheel hub that could be used for attachments but not all

This wheel has no attachment points, to be fair it was the only one we saw like this, all the others had holes of one sort of another, but it's possible that we'd get one or more of these

All the trailers had something of this sort on either side. This one was 302cm long and 50cm high, but there was some variation across the trailers, typically only a few centimetres

This is the standard size that they use. They do have some slightly taller ones, but they are unlikely to be used because of the possibility of fouling on overhanging trees etc.

The internal deck level is 130cm from the ground.

The curtains can be pulled back to either end. They compress down to about 150cm.

Wheels on the towing units vary. Some are double axle like this one. Others have single axles (see next photo). Many have different hub caps and/or alloy rims.

The wheels are the same size as those on the trailers.