They only enforce the coverage law when you get your Jeep inspected every year. The tread on your tires must be covered by flares, or they will fail you. I used to just run skinny snow tires to inspection and then swap them out after I got my sticker. I haven't had a problem yet, and Ive seen some crazy rigs up here with stickers, so I assume its a pretty regular thing to do. As long as you have your sticker, the cops seem to not care.