I grew up in SE Minnesota and wish I had first-hand experience and knowledge to share with you. Not much trail riding as there is so so much private land back there and never even considered a dual-sport or dirt bike. Where I live now in Idaho I have no interest in street bikes. Dual-Sport is great so we can ride legally to either get off pavement or connect off pavement routes. It's probably a lot better up where you live trail wise.
Generally, and I haven't run into a trail that didn't but out here we are allowed to ride motorcycles on the ATV trails. Obvious due to how wide the ATV's are, ATV's aren't allowed on the motorcycle single track trails. Hopefully, Minnesota is much the same, cross fingers for you.
But I still dream of riding Minnesota Arrowhead region one day. Anyway, stuff you probably know but looked it up.
OHV & ATV Trail Locations Map: Minnesota DNR
OHV state trails A-Z list: Minnesota DNR
Off-Road Trails : Explore Minnesota
ATV & OHV Trails to Ride on The Iron Range |