WITH its fleet of immaculate, instantly recognisable tankers that traverse the length and breadth of central Queensland highways, Emerald Carrying Company is a shining success story.

Celebrating the delivery of the company's 100th Kenworth rig on Friday, a special touch was unveiled in the form of a painting of the brothers' father and company co-founder Bill Haylock on the back.

After five decades, ECC is now Emerald's biggest full-time employer and brothers Greg, Peter and David Haylock couldn't be prouder of the reputation for excellence and staff loyalty the company has built. "Some of the best drivers here have been driving non-stop for 20 years," Greg said.

"We have some of the best truck drivers in Australia working for ECC and I would back them against anyone.

"We've taken a couple of our drivers down to the Australian BP driving championships and they won best team and both drivers were the best two there as well.

"So there's some really top notch people working for us."

Last year, ECC tankers carried 2.16 billion litres of fuel in 80 tankers from Gladstone to Longreach and north-west to Mt Isa, delivering to mines, service stations and fuel depots.

"We've just secured two long-term contacts with BP for Anglo and BMA which was really nice," Greg said.

Brown & Hurley's Rockhampton dealer principal Arthur Fowle paid tribute to the Haylock family as people who conducted themselves "with the utmost professionalism".

"They're a great family to do business with and the young fellows coming through in Ben and Matt are doing a fine job as well," Arthur said.

"Their trucks are noticed all around the country, whether it be tourists that travel and drop in and tell us they've seen these fantastic trucks… they're noticed on the road and everyone knows who owns them.

"There's not too many businesses where you get what is in effect the managing director on the forklift making sure the customer's load is put on properly and the sons out driving the trucks and getting it delivered on time."

Mayor Peter Maguire paid tribute to five decades of growth and success.

"It is fantastic to acknowledge the work of Bill and (wife) Joan and all the family that have built this business up and kept it going in tough times, good times and probably a bit of a downturn at the moment," Cr Maguire said.

"Well done to everyone involved."