BTC Trailers, of Trafford Park, Manchester. (Works photo).

Bulk tipping body on an BTC 4 in-line chassis.

Coupled to an AEC tractor, owned by Russell of Bathgate.

You tend to think of step-frame's as a modern idea, but evidently not, this would of course get the centre of gravity down by having the body runners on the outside of the chassis rails.

Done