Pro Series Trunnion Style Weight Distribution Kit Review

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Review of the Pro Series Trunnion Style Weight Distribution Kit


Today we're going to be taking a look at the Pro Series Trunnion Style Weight Distribution Kit with Shank, rated for a 1,200 pound tongue weight, and a 12,000 gross trailer weight, part number 49587. Now, we'll show you some footage of the vehicle and trailer out on the road, both with and without weight distribution system. Without the weight distribution system, you can see that it's kind of bouncy, and although the truck does an all right job of pulling this trailer, it creates a bit rougher ride, because there at the hitch it acts as a fulcrum, and it allows it to bounce, and creates a little bit of sway to where it just feels a little bit unstable. With the weight distribution system, as we go over the same section of road and his those bumps, you can see that it's keeping the trailer much more level, and as we hit them, it doesn't feel like as much sway, and therefore not nearly as bouncy, and a smoother ride. Driving this truck both before and after the weight distribution system, there's a very noticeable difference. Driving the truck just feels a lot easier, because it doesn't feel like that trailer is affecting you nearly as much as you're going down the road. Here we've got the truck and trailer without a weight distribution system attached. As you can see, the rear of the truck is squatting down, and therefore the front of the trailer is much lower than the rear of the trailer, which creates for unsafe driving because the front of the truck is lifted up higher, therefore taking pressure off those front wheels, making steering and handling more difficult.

The trailer is then unevenly weighted towards the front end. Now we're here at the rear of this truck so we can see how this trailer is attached. As you can see here, with the A frame, you can see that it's diving down towards the front of the trailer, and therefore making the rear of the truck squat. As you can see here, because of how the front of the trailer is angled down, and the rear of the truck is squatting, how low these chains are riding to the ground. These chains have already been twisted to help shorten them up a little bit. This definitely could use a weight distribution system to help correct this. Now we'll take some measurements to help us compare the truck with the trailer before weight distribution, the stock ride height without a trailer hooked up, and then we'll do it once more after with the weight distribution hooked up to see the difference.

With the trailer hooked up and no weight distribution, I'll take a measurement from the ground to the very center bottom edge of this fender here. Now I'll take the same measurement on the front. Then once you've got your measurement on the front, you can repeat that process once the trailer's been unhooked. You want to reference each of these measurements, so it's not a bad idea to write those down so you don't forget them. Now we've got our weight distribution system all hooked up. With that in place, let's take those same measurements at each wheel well in order to see what type of height difference we have.

We take that measurement at the rear fender again. It appears to be up about 3/4", which means that that's 3/4" closer to factory ride height, so that weight is now more evenly distributed between the rear axle of the truck and the axle of the trailer, which are going to give us better control an better feel going down the road. Now taking that front measurement again, it's gone back down about 3/4", which brings us almost back to the factory ride height with no weight. Now, with the weight distribution system, you can see that the front of the trailer is no longer diving down to where the front's closer to the ground than the rear is, but rather it's much more level. Now you can see how much better the front of this trailer is sitting up to make it level, and therefore also not making the rear of the truck squat down as much, because you can see how much more ground clearance we have underneath the chains here. We've got these chains that are connected to the spring bars, and at the other end of the chain it's hooked on to the mounting bracket that goes on top of the frame of the trailer. What that functions to do is help put tension on the top of the frame of the trailer, therefore pulling the tongue of the trailer up in order to level it out and help give the more even distribution of weight between the truck and the trailer. Where the system head mounts up to the adjustable shank that comes with it, you can see it's got these grooves here, and that's to allow you to give this more tilt as needed, to properly get it set to provide the right amount of tension to level out your truck and trailer.

The ball does not come with it, so you'll need to pick up the appropriate size ball that will fit your trailer that has a 1-1/4" stud. The adjustable shank on this weight distribution system can be put up or down so that it's in the drop or rise position to properly fit your trailer and truck needs. This weight distribution system is relatively easy to install. By following the instructions, you should be able to get everything in place and set up as needed to properly distribute the weight on the tongue of your trailer. To install this unit, I had to disconnect the trailer from the truck to begin with, and then I had to install the new shank that came with it. Once I had it disconnected, I used the trailer jack in order to jack this up to get the trailer level. Then with the trailer level, I took a measurement of the top of the ball here, so then I knew about how high I needed to put this once I had it mounted in the shank. With the head mounted in the shank, you typically want to put it to where the top of the ball is going to be about 3/4" to 1" higher than where your trailer's sitting, so it will allow for a little bit of sag in the truck still. One I had the head in place, I set it pretty well in the middle using these little plates to help bite down and make sure that it held there. That way, if I needed to make an adjustment later, I could. But that's where I started was in the middle. Then I loosely tightened up these bolts, and then reattached the trailer. Once I had the trailer reattached, I could put our mounting brackets on top of the frame, approximately where they'd be, and just leave them loose. Then I put my spring bar in, according to the instructions. That way I could see what point that chain would be vertical, so then I could adjust my bracket properly to be in that location. Then I tightened up the set screw on the bracket on either side. Once I had the set screw put in place, I hooked the chains onto the loop, and then used the provided bar to help gain leverage and pop it up into place. You may have to adjust which link it's in to gain the proper amount of adjustment that you'll need to evenly distribute the weight from your truck to trailer. Once you've found the right point, then you just slide these clips through, and everything's locked in place. Then finally, once you've got all that set, you'll want to be sure to come back up and torque down your bolts to the specification given in the instructions. That's going to complete our look at the Pro Series Trunnion Style Weight Distribution Kit with Shank, part number 49587.


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