Jumbo wheels on the ROVVER X 400 crawler from Envirosight provide a wide stance to straddle debris, plus the capability to center in lines 30 inches and larger. They add more than 100 pounds to the crawler’s weight, enhancing traction and travel range. The wheels are designed to add weight while maintaining a slim profile that lessens the effect of fast flows found in large interceptor lines. They mount with one bolt apiece and have key slots for positive traction. They are made of stainless steel and aluminum and have circular cutouts for the addition of more weight. 866/936-8476; www.envirosight.com.