Holiday Equipment was owned by 3 partners 2 Dutchmen and one Frenchmen one of the Dutchman was my mothers eldest brother and the other is a good family friend.When we first came out from Holland in August 1970 dad and i were taken to the factory in Mornington and we were shown the different stages of assembly, at that time the were working on a prototype camper which was the fore runner of the wind up roof camper trailer.My mother used to sew the canvas for them from home for 8 or more years . Later they set up a factory in Cranbourne and they had a outlet in Edithvale and Coburg. Mums brother passed aways some 30 years ago and the family friend is in very bad health in Queensland the Frenchmen at last report still in Melbourne but the business is not trading any more to my knowledge.
This article from August 1968 points to them being made by Holiday Equipment...
You'll note in the article there were three models, but none of the information I have explains what the difference between the models was. Also note in the article about the green and white striped walls on the annexe. Something you have to go look for, if you don't already have them, for the resto. I've got another article from 1969 (I think) that advertises a "new model" which has orange and white stripes on the annexe walls.
I have complete sets of canvas for two Cargill trailers and two annexes, one set of trailer fittings and two complete annex frames. If this is of any use, please contact me urgently on 03 9367 1271, as the metal ware is about to go to the scrap metal people.