The suspects pulled up to the Hribar Trucking site at about 2 a.m. Monday in stolen semi tractors, Mount Pleasant police said.
They were trying to hook a trailer full of Miller Brewing Co. beer to the tractors when they were interrupted. The men then fled, taking a different tractor-trailer rig full of Miller beer, and a semi tractor with no load.
Officials from Schneider National, who own the rig, declined to comment on the theft and ongoing investigation.
Police are looking for a white semitrailer with blue lettering reading "Great Taste of a True Pilsner Beer" and a white Freightliner semi tractor.
The village of Mount Pleasant is about 30 miles south of Milwaukee.
