(BILLINGS, MONT.) – A Minnesota couple is pleading guilty to drug distribution charges after authorities found 960 pounds of marijuana in their RV. Steven and Vicki Robinson of Milaca face a minimum of five years in prison after pleading guilty on Thursday. The RV was located in a Walmart parking lot after authorities were tipped off. They followed the RV to a casino where the couple was arrested after search of the vehicle. The Robinsons were released and are pending sentencing in March.