OK so it has rained seemingly constantly in the Ozarks since March. Hard to keep up with the mowing-always tall and wet. I used 2" electrical conduit and filled with sand. They weigh about 8 lbs each. I used U bolts to clamp them to the bumpers. Credit Jim Koenig with some brainstorming! It helps keep the old bathtub from spinning and the front end down going up hill. A little black paint will help!