5th Wheel Hitch Maintenance is something you might forget about, but it is one of the most important things you should be checking. Here's a quick look at how we keep our B&W Trailer Hitches operating smoothly. 1. Visually inspect all the exposed parts, bolts, springs, and other pieces. 2. Remove the 5th wheel head to expose the zerk fitting. Inspect the zerk for damage. Attach a grease gun to the zerk fitting and apply regular automotive grease until it begins to come out of the shaft,as seen i