Reese Elite Series Under-Bed Gooseneck Hitch Installation - 2017 GMC Sierra 3500

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How to Install the Reese Elite Series Under-Bed Gooseneck Hitch on a 2017 GMC Sierra 3500

Today on our 2017 GMC Sierra 3500 we'll be having a look at and installing the Reese Elite Series Under Bed Gooseneck Complete Hitch, part number RP30158-68. Here's what our under bed gooseneck hitch looks like installed. In the middle here, we have the spot for our gooseneck ball, then we have these four pucks outside of our gooseneck ball area. These are where we can hook up our fifth wheel or other accessory that utilizes those, such as a Reese Elite Fifth Wheel Head. It'll drop right down into these pucks, and then we can tow a fifth wheel trailer or a gooseneck trailer without having to have any adapters above the bed of our truck. This gives us a nice clean look. Everything sits underneath the bed, so if we still need to use our truck as a truck, we don't have any worries about not being able to have full access of our bed.

We have this nice bag that's included to store all of our accessories. Has a drawstring on it to secure everything inside. We find our 2 5/16ths gooseneck ball in there. Pull up right here, it'll drop on down, and you twist it and I locks in place. When you want to remove it, just pull up right here, lift straight up, and it comes out. Now when we're not towing our gooseneck trailer, we have a nice plug, goes down right there, to help keep any dirt and debris out of there or keep any loose material that we may have in the bed of our truck from escaping and falling out down to the road below.

For where our pucks are, when we're not towing our fifth wheel trailer we have these plugs that drop in as well to help keep any dirt and debris out of there so we can easily insert our fifth wheel head down into place. Now when we're towing our gooseneck trailer, we also need to have a safety chain attachment point. So you can just remove one of the plugs from our puck, take one of our provided safety chain loops, they have this handle here, lift it up, drop it down in, twist 90 degrees, push back down in, and it locks in place. Now when we're using this to tow our trailer, we have 6,250 pound capacity for our vertical load limit and a 25,000 pound max gross trailer weight rating. You want to consult with the owners manual of your GMC Sierra and not exceed the capabilities of the vehicle or the hitch itself. Now what I really like about this kit compared to other fifth wheel or goosenecks on the market, is that gives us the ability to tow both trailers at any given time, and with also have full use of our bed at any given time when we're not towing our trailer because it's all under bed. It's a fairly quick install, you only have to drill five holes in the bed of the truck, no modifications to the frame required at all.

Now that we've gone over some features, we'll show you how to get it installed. To begin our install, we went ahead and took down the spare tire. You don't have to do this, it is optional, but it does give you a little bit more room to spare. We're also going to remove our rear wheels. You don't have to do this but it does give you some more room to work and you'll be able to see better.

They're a 22 millimeter socket and eight lugs. Now we're going to take down our exhaust heat shield here. There are four bolts that hold it in place, one here on the top of our crossmember here for our frame, there's another one at the front crossmember at the top of it as well, and then we have two on our passenger side frame rail, and you can actually see those when the truck is down lower. These two you can't see. They're all 13 millimeter bolts. Just kind of have to feel for them. So we'll repeat the same process for the one in the front. We're just going to do these through the wheel well because it's a little bit easier. Okay, now we can grab our heat shield and just pull it on out and set it aside. Right now on the passenger side of our truck we're going to take out all three of our bed bolts completely. Here's one of them here. These are all 18 millimeter bolts, and then our front one on the driver's side, we're just going to loosen up these bolts a little bit and still leave them in place. Okay, there's our three on the passenger side, now we'll just loosen the ones on the driver. Okay, it's loose and still in there. That's what we're looking for. Right, in addition to the three bolts on the driver and passenger side that we loosened and removed, there is a fourth one located straight up through this hole. We need a long extension, still want an 18 millimeter bolt. Again, we'll remove the one in the passenger side and loosen the one on the driver. Okay, on our sides of our truck here on the wheel liners, I marked out where the center of our rails are going to be positioned underneath the bed. This way we know where we're going to insert them at. I determined that by taking our frame bracket here, two holes here and here are where it's secured to the frame with the vertical elongated holes. So I held it in place, and then I found the center of the holes that are horizontal elongated, and just marked there so we know where our rails are going to sit. Okay, here are our rails. These large holes here will face up towards the bed of our truck, and these threaded weld nuts will face down towards the ground. These rails, there are two, they're exactly the same. We're going to lift up the bed of truck on the passenger side and slide these on top of the frame so it rests on top of the frame underneath the bed of the truck. Okay, now we'll have someone raise the bed of the truck while we slide our rail into position. Here's a tech tip too. You could also use a long 2x4 or a metal pipe or something, and you can use that as a pry bar to pry the bed up so you don't have to be standing underneath it for an extended period of time. This makes it easier. All right, now that we're underneath the vehicle you can see how the rails are positioned. Our front rail here is just behind the edge of our fuel tank, and our rear rail here, this is an 8 foot bed truck, it goes right up against this bed crossmember here. If you have a 6 1/2 foot bed truck, it'll be further on back. Now we have two T-15 torque screws in our wheel liner. We're going to remove these so we can pull our wheel liner out a little bit. Now we'll pull back on our wheel liner to expose the end of our rails, and we'll take our weld nut that's on the spacer plate and insert it into the end of our rail. Do the same for both of our rails on both sides. Now we'll take our large hex bolt and large conical tooth washer, place the washer on so the teeth face away from the bolt head, and we'll bolt our frame bracket to the rails using that bolt. Okay, we'll one started, then we'll do the second one. Now we'll take our pull wire and we'll insert it through our frame bracket into the hole in the frame, and we'll come get it on the other side. Okay, how we'll push the pull wire onto the frame, and it'll come out this hole right above our bump stop right here. So we have a spacer block here and a carriage bolt here. We'll take the spacer block, put it on the pull wire and insert it into the frame, and we'll thread our carriage bolt onto the pull wire, and we'll insert that into the frame as well. Okay, now we'll pull our bolt on through the hole. We can remove the pull wire. Place on the conical tooth washer, the teeth will face towards the bracket, then we'll tread on a nut. Now we'll do the same procedure for the rear hole. Okay, now we'll repeat the same process for the other side of the vehicle. We've gone ahead and marked all of our locations in the bed of the truck where we're going to drill. You can find the measurements for your particular bed length in the instructions, and when you do these measurements, it's imperative that you make the measurement from the end of the bed and not from the end of the tailgate. Okay, we'll make a small pilot hole in all of our locations. We're going to start with the gooseneck ball hole first. Okay, now we'll drill out our gooseneck ball hole with a 3 1/2 inch hole saw. Okay, now we'll use a 3 1/4 inch hole saw and drill out our remaining four holes. All right, now that we have all of our holes made, this is a really good idea to take your spray paint or touch up paint and go along the edges of your cuts. That way you don't have to worry about any rust forming on down the road. If you don't have any touch up paint that matches your truck, you can just use some clear coat, which will work the same way to be a protective layer. Won't match your truck's paint in the bed, but it will prevent it from rusting. Okay, now we can install our puck system into our rails. Take one of our flat washers here, drop it on down, I'll take one of our pucks, see it's key it only goes in one way. We'll sit it inside our trim ring, drop it down into the bed, take one of our lock washers and the bolt, use an Allen key, it's a 3/8ths, and we'll get these started. We'll do the same for the other three pucks. Okay, this is the gooseneck section of our hitch. This goes underneath the bed of our truck. We have four attachment holes that'll bolt to our rails. This hole here for the ball to go through is offset. It'll be closest to the front of the truck. We'll secure it to our rails with four bolts and four conical tooth washers. The teeth will face our hitch like that. Now we need an extra set of hands to raise this on up because it is pretty heavy. All right, now that we have all of our hardware in place, we can start to tighten things on up. And now we'll torque all of our hardware to the amount specified in the instructions. Okay, now that we have our bolts snugged down that hold our pucks in place, we can start tightening down our rails. We'll do the rails to the frame bracket first, using an inch and 1/8th socket. Then we'll use 15/16ths socket to tighten up the brackets to the frame of the truck. Okay, now we'll use an inch an a quarter socket to tighten up the bolts that hold our gooseneck head in place. We have someone in the bed of the truck to hold it still, to make sure it doesn't get out of center from the hole that we drilled in the bed. Now we'll torque all of our bolts to the amount specified in the instructions. Now we'll reinstall our screws our wheel liners, and now we'll reinstall our bed bolts, and that completes our look at and installation of the Reese Elite Series Under Bed Gooseneck Complete Hitch, part number RP30158-68 on our 2017 GMC Sierra 3500.

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Brent H
Test Fit:
Brent H

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