A member of the Sonoma County chapter of the Hells Angels was arrested on charges including possession of a loaded weapon by a gang member, the CHP said Friday.

Trenton Miles, 26, of Santa Rosa was held after he was spotted speeding on Highway 101 in Cotati in a Ford F-150 pickup behind a group of motorcycles, Officer Jon Sloat said.

Miles was tailgating the motorcycles at about 80 mph, Sloat said.

A search of the truck turned up a motorcycle vest Miles had removed that contained the loaded semi-automatic pistol, Sloat said.

The truck was towed after it was determined to be a rental and none of the occupants was authorized to drive it, Sloat said.

Miles, who was on probation for drunken driving, was booked into Sonoma County Jail on gun and marijuana possession charges, Sloat said.

You can reach Staff Writer Paul Payne at 568-5312 or paul.payne@pressdemocrat.com. On Twitter @ppayne.