The firm has bought a 26-tonne Mercedes-Benz Arocs with Charlton's BuildLite triple dropside alloy body, with a rear-mounted Hiab crane.
As well as another 6x2 Mercedes-Benz chassis with a dropside body and crane, the High-Wycombe operator has bought two 18-tonne Daf LFs with Charlton tipping bodies and cranes.
These will be used for the delivery of sand, topsoil and aggregate materials.
Grant and Stone chief executive Nick House said the new Arocs increased its "operating versatility quite considerably”.
He said: “On the one hand, the 6850mm body gives us lots of deck space, so the truck can easily handle almost every item in our inventory.
"A long body also provides plenty of room for bulk loads, and nor do we have to stack too many products on multi-drop work.
"In both types of operation, unloading the truck is therefore simple and straightforward, which speeds up the job quite considerably.”