Not many products can get around the country - or overseas - without being carried by truck at some stage.

So road freight efficiency is a huge part of pushing up national productivity.

The Australian Trucking Association says a $400 million Federal plan to boost truck productivity will deliver $4.4 billion in economic benefits every year - and they've cited the example of switching from conventional semis to fuel efficient  A-doubles. 

Rural reporter Gabrielle Hodson spoke chair Mark Parry