Tristar Industries is a pioneering and innovative Darwin manufacturer of door opening side tipping semi-trailers, water and fuel tanks, low loaders, dollies and other mining, transport and heavy earthmoving related equipment. This gives Ostojic Group the capacity to build a wide range of equipment tailored for its customers.

Tristar was one of the first companies in Australia to build Side Tipping Semi Trailers and continues as a leader in their design and development. Tristar also has a substantial involvement in the design and construction of mining and other engineered equipment. Tristar has on site their own mechanical engineer, profile cutter, press operator, diesel mechanics, auto electricians, machinists, hydraulic experts and some of the best welders/boilermakers in the country.

Tristar side tippers are positioned highly throughout the industry due to their reliability, durability and stability, as well as the cost saving benefits achieved through its side tipping action. They can be found in central and north Queensland, the Northern Territory, Western Australia, including the Pilbara and Kalgoorlie regions, regional and metropolitan areas of Victoria, NSW, SA and overseas.

The side tippers allow more trips per day with quick, clean discharge while on the move. Side door design helps prevent the load from spilling underneath trailers, reducing potential damage to tyres.

Tristar products are made from high quality, heavy duty components to give them a long and useful life, minimized risk of breakdown and downtime and ease of maintenance. Low hydraulic pressure reduces potential damage to hydraulic hoses and hoists. A low centre of gravity aids the stability for both on and off –road application and can handle a wide range of products. They can be built single, double, triple or special road train configurations with left or right hand side opening doors.


Projects have included:

  • Construction of Belly Dumpers for BHP Billiton
  • Side tippers/Quads constructed and supplied to each Australian State and Territory
  • Doorlus side tippers trailers constructed for mining application
  • Supply body and semi water carts for both civil and mining projects
  • Trailers have been built for special application to carry rail lines

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