Since so many of us use diesel trucks and SUVs to tow trailers these days, we decided to put together a two-fer: a combination of accessories designed to enhance diesel performance and reliability, along with items that make it safer, easier, and more convenient to tow.
Keep Tabs on TempsHypertech's add-on temperature module for its HyperPAC performance automotive computer can monitor and record temperatures ranging from minus 300 to 2400 degrees F. It comes with an external temperature sensor that can be programmed to track EGT at a touch of the computer's menu option. Add more sensors, and the module can track as many as 16 different temperatures. Hypertech; 901/382-8888.
www.hypertech.com
Riding on AirIf you tow a heavy trailer, such as a fifth-wheel RV or a large horse trailer, you can convert your -or one-ton Ford, GM, or Dodge pickup's rear suspension to a setup much like those used on big rigs. Air Lift's Road Tamer kit replaces the factory steel leaf springs with air springs and includes the SmartAir automatic leveling system. The setup provides a smoother ride (empty or loaded), better roll control, cushioned road shock, and less stress on your vehicle, passengers, and cargo. Air Lift Company; 800/248-0892.
www.roadtamer.com 
Getting the AssistHell-Ya's Hitch Helper slides into a two-inch receiver hitch and stops the truck from squatting when it's towing or hauling a heavy load. By keeping the truck level, stability and braking improve. The Hitch Helper includes a load-rated tire and a coil spring to smooth out the ride and reduce hopping and weaving. It's height adjustable and is also available for dualies. Hell-Ya Productions; 877/851-0096.
www.hell-ya.com
Clean FuelDiesel-Pure from Tough Country will remove water, silt, sand, and other contaminants from diesel fuel. It works through the force of the engine's fuel pump. The unit also will decontaminate gasoline, transmission fluid, motor oil, and even JP8 jet fuel. Tough Country; 979/543-9204.
www.toughcountry.com
Protect Your InvestmentWhether you tow a boat, a show car on an open trailer, or an RV, you certainly don't want rocks and road debris to hit it. The Towtector Shield provides more protection than mud flaps, especially at highway speed, thanks to full-width coverage and a support bar in front of the brush strips that prevents blowback. The shield comes in sizes that accommodate different vehicle heights. Towtector; 888/735-3553.
www.towtector.com 
Safe and SecureThe Bully CouplerLock increases towing safety and trailer security. This locking model replaces the coupler latch pin and secures the coupler to the trailer hitch ball. When not towing, the lock also acts as a trailer theft deterrent. To use it, push in to lock, use the key to unlock. The CouplerLock fits 17/8 - and two-inch couplers. Bully Truck Accessories; 800/237-7560.
www.couplerlock.com
Up, Down, and AroundEver walk behind your truck and smack your shin on the hitch ball? Then you'll appreciate B&W's Tow & Stow Receiver Hitch. It adjusts up and down in one-inch increments and flips around, moving the hitch balls out of sight and out of the way in tight parking lots. It's available in double- and triple-ball combos and has a Class-IV rating for 1000 pounds vertical tow weight and 10,000 pounds GVW. B&W Trailer Hitches; 800/248-6564.
www.turnoverball.com
One's Good, Two's BetterATS offers a twin-turbo upgrade kit for Cummins 5.9-liter diesels. The smaller turbo allows for quick spool-up, while the large turbo delivers high power and low EGT. Both turbos are designed to reduce high-milage fatigue. The system also includes an ATS multipiece exhaust manifold; its pulse exhaust-flow design helps spool the turbos up sooner with less backpressure and increased fuel efficiency. ATS Diesel Performance; 800/949-6002.
www.atsdiesel.com