The association conducted an exit poll of visitors to last week's Commercial Vehicle Show and 244 individuals were asked which political party they think best represents the interests of the road haulage and logistics industry.
The Conservatives took a huge majority at 57.7%; Labour was cited by 8.2%; the SNP and Green Party shared 2%; less than 1% picked the Liberal Democrats; and 13% believed none of the main parties had the industry's interests at heart.
Several commented that they feared fuel duty could increase under a Labour-controlled government.
"Under the last government, our industry and the UK's consumers benefited from a sustained fuel duty freeze," says Richard Burnett, RHA chief executive, adding that other political parties have treated fuel duty "as a cash cow".
He adds: "The political parties need to make clear where they stand on the issues of fuel duty and road investment. These are two hugely important issues, both politically and for the economy."