If you are going to be going off road, keep in mind that most Emergency Road Service companies will not venture more than 100 feet from a paved road. If you are just occasionally going to be getting off of the pavement, perhaps a set of tire chains would suit your purpose better. They will work on loose dirt as well or better than tractor lug tires. That way you can take them off once you get back on the pavement and avoid the other problems that you get with an aggressive tire pattern. My rear tire chains only take about 20 minutes to install.