In Manitoba, it can rain or snow on any given day of the year. It sits on top of our trucks, and works into the nooks and crannies. Moisture then sits on our roads and driveways, and attacks our vehicles from underneath. This is why cars and trucks tend to rust from the bottom up. To compound the problem, we use chemicals like salt and calcium chloride to melt snow and ice, which speeds up the corrosion process.
Pickup trucks are particularly susceptible to damage. The carrying capacity of your truck depends on a large clearance between the top of the tires and the body of the truck, which makes the problem worse. The rear wheels are always drive wheels, and in bad weather they slop more stuff up against the underside of the vehicle than the front ones do. The material they throw is particularly bad for the truck, featuring a triple threat of stones and other debris that can chip the paint and leave the metal unprotected, abrasive grit to sand off the paint, and wet, corrosive sludge that will attack the metal and make it rust.
There are things you can do to stop the attack on the underside of your truck before it gets too far ahead. The addition of mud flaps or splash guards will catch a lot of the stuff the wheels are throwing up, and keep it from hitting the quarter panels and the underside of the box. Frequent washing will remove corrosion causing materials before they can cause harm. Coverage from above will stop the water from seeping between panels, where it can expand when frozen, opening up the seams and leaving the body open to more damage. A tonneau cover and bed liner, like the Full Metal Jacket spray on coating will help.
Come see what Carlson Truck Outfitters has to help protect your whole truck, including your fender wells. It will thank you for it.