IN THE BAY Tractors and trailers were built to stay a happy couple, but even simple relationships can turn messy if not given enough attention. By Seth Skydel [ TRAILERS, TOWING & SPECIALTY ] leets have several high-maintenance relationships when it comes to tractor-trailers, such as with aftertreatment and tires. But maintaining those relationships should not come at the cost of the simple-yet-vital connections that hold everything together-the kingpins, fifth wheels, and trailer lines. After all, you wouldn't have a tractor-trailer without them, and if something goes wrong, you might end up with a tractor here and a trailer there. 16 Fleet Maintenance | July 2022