More than half the trucks stopped during a 16-hour police operation on the A55 near Holyhead were taken off the road because they were unsafe.
Holyhead is a main terminal for traffice between Wales and Ireland
Of the 174 vehicles halted during Operation Mermaid, 91 were prevented from moving until a dangerous defect had been repaired.
But North Wales Police chief constable Richard Brunstrom described the fines handed out to some of the offenders as "derisory".
He said the offences put lives at risk.
Nine people were arrested at the roadside following the checks.
Two appeared in court almost immediately and two drivers - one from Poland and the other from Ireland - but working for Irish hauliers - were fined £250.
Mr Brunstrom said on his blog, or web diary, on the force website: "I do not believe that a multimillion-pound international haulage business is going to behave better because of a £250 fine.
"These are very serious offences, literally risking the lives of others - and a derisory penalty like this is going to make no difference at all.
"Big businesses need big penalties," he added.