I am about 100 miles south of the Canada border in northern Minnesota. I have 6 70lb sand tubes that I put right over the rear axle. So 400+ lbs. Add in all the gear in my Ramboxes and I don't think I have to, but it certainly gives me peace of mind. Really helps with stops and starts around town. When most are spinning their wheels trying to get going again, I just crawl away from the intersection. I have a cover so they last about 5 years. When its time to replace them, its into the sandbox they go.