Half-ton pickups often come...
Half-ton pickups often come with V-8 engines and optional towing packages that allow them to tow up to 9,000 pounds. But be aware: Identical-looking pickups may have very different towing capacities. Best to check the Vehicle ID sticker.
Step 2: The Door Sticker
A second source of information is the Vehicle Identification sticker on the inside of the driver's doorjamb. It will say what the Gross Vehicle Weight Rating (GVWR) is and how much weight each axle can carry. It also specifies the exact tires you must use, the exact wheels, and the exact tire pressure. This, combined with the information in your owner's manual, will tell you how heavy a trailer you can tow, how much cargo you can put in the tow vehicle, and how much tongue weight your combination can handle, given the hitch you plan to use.
The door sticker information underlines the need to pay strict attention to wheel and tire engineering. It has become stylish to equip new trucks with larger aftermarket wheels and lower-profile tires. Dealers do it to dress up a truck for quicker sale and so they can charge more. Unfortunately, if your truck or SUV does not have the OEM tires or wheels, it may very well have compromised towing capacity. After checking the door sticker, compare the numbers to the data on the tire sidewall to make sure you have the correct tire and wheel combination. Most important would be to take note of the given load limit. Generally, light truck tires have load ratings between B and E, with B being the lightest and E the heaviest.
You should also be aware that lug nuts are key wheel components that absolutely must be torqued to the proper spec. Those custom lug nuts that come with stylish alloy wheels may not be Department of Transportation (DOT) approved fasteners or may not have the same length of thread engagement your OEM wheels had. Locking lug nuts installed for security reasons may also create a weak link. If there is any doubt in your mind about the capacities of the wheels and tires you have and the fasteners you are using, it would be wise to reinstall the standard combination or lighten your load accordingly.
Step 3: Get the Right Gear
"Properly equipped" usually means having the right hitch, a matched hitch ball, a properly adjusted trailer brake controller, and towing mirrors. Most manufacturers' ratings are based on the assumption that you will be using a weight-distributing hitch; ratings for a simple weight-carrying hitch will be much lower. A weight-distributing hitch takes weight off the rear axle, enhancing carrying capacity and stability. Your best bet is a well-designed, weld-in type of hitch, which is generally better quality than bolt-on hitches. The hitch ball itself needs to be matched to the weight of the trailer. Just like everything else, they come in a variety of rated strengths and capacities.

The type of hitch you use...

The type of hitch you use makes a huge difference in towing capacity. This is a weight-distributing hitch. WD hitches are not supplied by the OE manufacturer but are always specified as necessary for higher towing capacity. It consists of a draw bar, a matched hitch ball, spring bars, and snap-up brackets. It distributes the tongue load between the truck and trailer, practically doubling the weight you can tow. For even higher towing capacity, a bed-mounted gooseneck hitch can tow a trailer configured as a 5th wheel. It's not uncommon to see towing ratings of 5th-wheel trailers as high as 20,000 pounds and more. With just a regular, weight-carrying hitch, the maximum trailer weight for the same 1-ton pickup might be 6,000 pounds.

With most vehicles, the "max...

With most vehicles, the "max tow rating" claimed in advertising depends entirely on the configuration of the truck and drivetrain and will often specify the use of a weight-distributing hitch. This Suzuki Equator can handle up to 6,500 pounds, so it can readily tow loads like this 4,100-pound bass boat. However, only the 2WD, V-6 Extended Cab with the Sport Package and automatic transmission is actually rated to tow 6,500 pounds.

There are five classes of...

There are five classes of receivers, ranging from Class I (2,000 pounds) to Class V (12,000 pounds using a Class V hitch). Your hitch, drawbar, and hitch ball must match, so you'll need a hitch ball rated the same strength as your hitch's maximum. This Class 3 receiver, on this half-ton truck with this type of trailer, is good up to 6,000 pounds.
You'll need reliable brakes in your tow vehicle-the stronger the better-and reliable brakes in your trailer. To coordinate the two sets of brakes, you'll need a good brake controller adjusted such that the rear wheels brake strongly enough to be felt and in concert with the tow vehicle's brakes, but without locking the trailer's wheels. The controller can be installed at any trailer/towing service center, or you can install it yourself if you don't mind doing simple wiring. If you have a new truck, trailer, or controller, it would be wise to take the combination for a testdrive or two before you head out on the vacation trail, just to get the tuning right.
Visibility is another priority. When towing, your rearview mirror will be blocked and your side mirrors useless. Extended towing mirrors are needed. They're available in a wide variety of styles and price points, from clip-on ones to more permanent, bolt-on mirrors. It would be really scary to hit the road without them.