The back of a truck trailer is a sight commonly encountered by motorists and passengers along Australia's roads and highways.

Now, a north Queensland couple has been inspired to put the metres of often blank steel to good use, and turn the minutes motorists spend waiting to overtake trucks into dollars for charities.

'Dolly' Everett's tragic story sparked a national anti-bullying campaign earlier this year when her family went public about her suicide. ( Facebook: Akubra )

Graziers and livestock transporters Mick and Tess Pemble, from Homestead, 220 kilometres west of Townsville, have turned the back of their cattle crates into publicity space for charities close to their hearts.

"I did see one crate from down south with Dolly's Dream written on it, and I just thought we should support a few charities too," Ms Pemble said.

As well as that charity, Ms Pemble organised to print signs carrying the logos of drought relief organisation Aussie Helpers, veteran support body Soldier On, and childhood cancer support group Golden Octopus Foundation.

"I checked with all the charities first to see if it was okay before I promoted their charity," Ms Pemble said.

"If you're driving along behind a stock crate and you're sitting there in the passenger seat looking at their number plate, you may as well be googling and seeing who these charities are and what they do.

"Even if we can't financially help out, hopefully this might in a widespread area give people more awareness."

Invaluable help for small charities

Cathy Johnson, mother of Golden Octopus Foundation founder and teenage cancer patient Keely Johnson, said the exposure for small charities was invaluable.

"Tess contacted me and said she wanted to put our charity in front of everyone's eyes," she said.

"We couldn't be more grateful for the support she and many other truck owners have given us."

Ms Johnson said with several trailers sporting the group's logo, the charity was receiving support from far and wide.

Queensland teenager Keely Johnson (L) founded the Golden Octopus Foundation in 2015 after being diagnosed with a rare childhood cancer. ( Facebook: Golden Octopus Foundation )

"There's a semi from Ayr in north Queensland that travels from Cairns to Melbourne every week. It's regularly being seen by thousands of new people along the way," she said.

Golden Octopus aims to raise $380,000 to place a childhood cancer nurse in rural communities where families currently have to travel away for support.

So far the organisation, named after the eight groups of childhood cancer, has raised $200,000 towards that aim.

More truckies getting on board

Aussie Helpers has delivered drought and natural disaster relief to rural communities across Australia. ( Supplied )

Since putting the signs on the truck last year, interest from other truckies about adding charity advertising to their own trailers has grown.

"We just started getting back into [trucking] with the cattle and meatworks re-opening," Ms Pemble said.

"Any direction we go, hopefully people will see it and mention it.

"I had one guy from New South Wales contact me and I said 'If you want to do it, do it'."

At about $50 per 1 metre sign, Ms Pemble said it was a worthy investment to support hardworking fundraisers.

"For that little bit of money to put advertising there, you can really spread the word," she said.