Truck beds always seem to take a beating, as most of us need to use our trucks for what they were intended, work. Once a bed gets eaten away with rust it loses its strength and usability. To prevent this, try and spray out your bed at least once a week. If you have bed-protecting devices such as mats or drop-in liners, it's a good idea to inspect underneath them about once a month as sand, grit, and water tend to hide under the surface and eat away at the bed. A little inconvenience now may save you a lot later.