The vehicle was searched at 8.30pm by the Longford and Roscommon Divisional Drugs Unit.
A man was also arrested by the Gardaí.
Aged in his 60s, the suspect was taken to Longford Garda station and is being detained under Section 2 of the Criminal Justice (Drug Trafficking Act), 1996.
€30,000 worth of cocaine was seized along with €20,000 worth of canabis.
Investigations are continuing.