Haulmark ST3 Trailer. Mayne Nickless

Hi all, my Haulmark ST3 Trailer , chassis number 9277, was one of a batch of 8 built in 1988 for Mayne Nickless. Haulmark have been very good with information but were unable to tell me where it may have been based. If anyone has any info that can be substantiated I would love to hear from them. It was originally built as a 40 foot trailer with a timber floor, however sometime during it's working life it was extended to 44 foot, still with a timber floor. Cheers Tim