They were made in Queensland by a company called Saber Fibreglass, which built large cruiser power boats.
Several of the land yachts were transported to Adelaide for a TV commercial shoot that occurred at Lochiel SA (Lake Bumbunga).
The TV commercial was for a Canadian Beer Commercial 'Labatt Blue'
The commercial had 6x yachts (I think) and a hot air balloon.
At the end of the shoot ALL the yachts were purchased by Martin Bell and then on sold by his business 'SA Landsailor Sales'
The Red / White yacht was purchased by Rod Dunning
The Pale Blue / mid Blue yacht yacht was purchased by Graham Parr a 6" aluminium wing mast was added on a very thick sail that was Navy blue in colour.
The Blue / Purple trim yacht was sold to Andrew Royce and tricked up with fancy mag wheels.
The Orange Yacht had a 6" aluminium wing mast and then to a 12" fibreglass Wing mast, a windscreen was added, this fact was owned by Martin Bell. The front wheel on this yacht was changed to a 'Vesper' scooter wheel and suspension..... Worked VERY well.
There was also a Yellow Yacht and also a Green yacht .... I am unaware what happened to these
The reason the yachts stayed in Adelaide was the local sport was quite active then and it was a saving on transport back to Queensland.
The only failing part on the yachts seemed to be the rear axles... they were alloy cast and they bent with heavy use this made the bum of the yacht to scrape a bit.. some axles were changed to Fiberglass axles made by using FG rovings (like string used in FG chopper guns).
The roving string was wound between 2 large nails and moulded with resin in a 2" aluminium extrusion as a mould.
Sails were very basic with a slip over the mast pocket style.... the exceptions being the ones made for the wing masts.
here is a link to Labatts commercials ....The one made at Lochiel was probably produced in the mid to late 1980s ..... I haven't had a good search on this site.
www.youtube.com/results?search_query=labatts+blue+commercials