Wow, Minnesota is screwy with trailer laws. Towing tandem is only legal if the first trailer is a 5th wheel camper, and the 2nd trailer is a boat.

Legal width is 8'-6", except that goes out the window when its a boat, you can tow, "I think", 9' if its a boat trailer. Weird huh?

I towed tandem boats from Omaha to the far western edge of Nebraska. 50mph cross wind, and a driven out road. I was very nervous, my FXone was line to line way more than I was comfortable with.