When it comes to towing, there are many factors that go into ensuring everything is done safely. For starters, you need to know how much you're planning to tow and how much your vehicle can safely tow. You need to have the proper hitch installed for the trailer you're using. And of course, you need to be comfortable with maneuvering the vehicle and driving with a heavy load in the back.
Still, a driver can do just about everything right when it comes to setting up a trailer and still experience sway when they get out on the open road. Nobody likes the feeling of having a trailer start to fishtail behind them, as this can be extremely dangerous. In some cases, it's possible that you'll need additional towing accessories to get the job done.
One of the most useful towing accessories is a suspension modification know as a leaf spring. Essentially, a poor suspension will move around a lot, and the wheels may actually come off of the ground while driving. This can jostle a trailer and is generally considered bad for towing. A good suspension keeps the wheels on the ground, and this is what a leaf spring can assist with.
Leaf springs are installed on the frame of the trailer, near the axle, and come in several varieties. The most basic are monoleaf springs, which offer a marginal improvement but won't exactly revolutionize the way you tow. Multileaf springs are made for heavy duty loads and provide a more noticeable upgrade. There are also two further varieties that can be either mono or multileaf: double-eye and open-eye. This basically changes the way that the spring mounts to the trailer - double-eye uses two circles that are bolted, while the other has one circle and a hook.
To know which kind of leaf spring you'll need, you'll have to get underneath the trailer and examine the mounting area by removing the wheel. You should then notice two metal hangers - this is where you mount the spring. Depending on the set up you'll see if you need double-eye or open-eye leaf springs.
Installing a leaf spring is easy. You'll use two U-bolts, or horseshoe-shaped rods, to fasten the leaf spring to the axle. The spring can either go over or underneath that axle. Be sure you check the leaf spring for wear on a regular basis - a cracked one can do significant damage to your trailer.