Many years ago(20+)I had a curtainsider on round trips to Spain with a fixed roof and a moveable centre support each side and 20 straps hanging from a centre pole in the roof.In those days I only recall one other company with tautliners(Williams,Carmarthen?).The trailer had a few quizzical looks at loading points initially but after regular visits and nothing falling off they were accepted.I accept that things are a lot different these days.