Six trucks and five trailers belonging to SAS Tipper Hire were inspected by NSW Police and Roads and Maritime Services at a heavy vehicle inspection station at Wetherill Park on Friday morning.

Three minor defect notices - for a minor air leak, minor brake imbalance and a seatbelt that was slow to retract - were issued.

Roads and Maritime Services (RMS) Director of Compliance Roger Weeks said inspectors went over the trucks with a "fine-toothed comb"  and checked everything from seatbelts to brakes and steering to suspension.

"We've only found three very minor defects, so what that suggests to us is that this company is serious about their safety [and] serious about their maintenance," Mr Weeks said.

"If every truck and dog on our roads was maintained to the same standard that we've seen this morning [Friday] that would be good news."

Friday's comprehensive roadworthiness checks came after the driver of a truck and dog, carrying a load of sand, lost control as he travelled down the pass about 3.30pm on Monday. The truck then slammed into a concrete median barrier and flipped onto the opposite side of the road, before exploding into flames.

The truck also downed a number of power poles and slammed into two parked cars. It narrowly missed hitting another car travelling up the pass. The driver, a 30-year-old man, suffered a fractured arm. He was the only person injured.

Investigations into the crash are continuing.

Mr Weeks said every major crash triggered an inspection.

"We will look at an operator and they can expect a visit from the police and from Roads and Maritime," he said.

"We do need to assure ourselves and all other road users in NSW that these trucks are safe to continue to drive on our roads.

"We know the majority of those in the trucking industry do the right thing every day, we've got some very professional truck drivers and hard-working operators that keep our state moving ... but for those who are unwilling or unable to do the right thing, it's only a matter of time before Roads and Maritime and the NSW Police take action."

Traffic and Highway Patrol Commander Assistant Commissioner Michael Corboy said NSW Police would continue to crack down on dangerous trucks and dangerous operators.

"Operators and drivers who are not doing the right thing are unfairly putting everyone else on the road at risk.

"We will continue to do everything we can to make sure they are taken off our roads" he said.

SAS Tipper Hire was contacted.