Ok so no pics of this as i didnt have a camera with me, and we were both moving (slowly) in oposite directions
Saw this wagon this morning, odd looking thing. Basically it was like a 2-axle Day cab tractor unit, but instead of having a 5th wheel it had a box fitted on the back with a tail lift. All white with no livery. Didnt look like a home made bodge or a removable box.
Wondered what on earth the point was, volume wise it wouldnt have been able to hold much more than, maybe even less than a transit luton.
The RAF had Sammels fitted like that but without the tail lift i think, no 5th wheel but a box on the back for weights, they used to tow the big 50 odd ft radar trailers with them.
When the Radar boys disbanded they were going to replace the box with a 5th wheel, but none of the units wanted them as they were much to slow.