Its new Arocs 3240K was specified with the straight-six 394bhp engine mated to a Mercedes PowerShift automated gearbox.
And, with an Aggrelite steel tipping body by Boweld plus a full complement of safety features and on-board weighing, it's delivering a 19.5-tonne payload.
"Every kilo counts in our operation and that's a pretty good figure," states group transport manager Chris Cooling, who is responsible for Day Aggregates' mixed-marque fleet of 150 trucks, most eight-wheelers.
"We used to run Mercedes-Benz 18-tonners, but over time they became a bit heavy, and we've previously steered clear of its 32-tonners for the same reason," he continues.
"But the 8x4 Arocs is right on the money in terms of weight and payload capacity. It also looks to be every bit as strong and well-built as you'd expect and, if it lives up to its early promise, is going to be more fuel-efficient than any of the other eight-wheelers we have in the yard."
Cooling says it was these factors, coupled with the persistent door knocking of Rossetts' sales people, that convinced the firm to give the truck a trial.
"Day Aggregates is the biggest tipper operator in our area," observes Rossetts Commercials dealer principal Perry Reeves.
"This is probably the most important vehicle we have supplied over the last couple of years," he continues.
"I've every confidence that, backed-up by Rossetts' 24-hour after sales support, the Arocs will prove itself worthy of a more substantial role in the Day Group fleet."
Day Aggregates' new Arocs is based at its Newhaven, East Sussex, depot and is currently working on the £94-million project to build a relief road between Bexhill-on-Sea and Hastings.