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The Basics of Fifth Wheel Trailer Hitches

I’ve been seeing a couple of fifth wheelers coming through the showground and they’ve been feeding my desire for a fifth wheel in our life. They’ve been mostly the Travel Home brand (below), which I love, and it’s made me realise that I didn’t actually know what they’re talking about when it come to fifth wheel trailer hitches.

Travelhome Fifth Wheel exterior

I heard words like gooseneck, hitch and king pin being flung around, so I thought I should figure out what they all mean.

Heck, I realised that I don’t even know why these types of trailers are called a fifth wheel?!  Answer: The fifth wheel connects to the tray bed of the tow vehicle in a circular shaped hitch or turntable, which kinda looks like a wheel, so that’s how it became the ‘fifth wheel’ of the tow vehicle.

So if you’re in the beginning stages of looking at a fifth wheel campers, here’s your primer on hitches…

Fifth Wheel Hitch

A fifth wheel hitch has the pin on the trailer (it’s called the king pin) and it latches into the fifth wheel hitch that sits in the bed of the truck or ute.

RV showing the king pin on a fifth wheel coupling

The arm that goes from the trailer to the king pin is called the king pin box and is used to extend or shorten the distance from the trailer to the king pin.

The king pin slides into the fifth wheel hitch, which is the part that sits in the bed of the ute. It has a sort of horseshoe shape that I’m sure you’re familiar with. Here’s a pic of one, just in case:

fifth wheel hitch shown in the bed of a truck

BTW – this is the type of hitch that heavy duty truck and trailers use, hauling goods all over the country.

As you can imagine, these fifth wheel hitches come in a MULTITUDE of different formats with different things that they can do.

They say, that a fifth wheel hitch is only really appropriate for long bed utes, where the bed of the truck is 8ft or longer. This is because the king pin (and therefore the hitch) needs to sit between the cab and the rear axle. If you have a short bed ute, the hitch will be too close to the cab and the front of the trailer is gonna collide with your cab when you turn tight corners. Picture below as a bit of explanation:

Diagram of a fifth wheel on a short bed truck, where a sharp turn causes the front of the trailer to collide with the cab of the truck.

Now, if you already have a short bed ute you can still use a fifth wheel hitch, but you will need to use a slider hitch.

Slider hitch

This is a hitch that slides further back (towards the tailgate) in the bed of the truck only when you’re doing tight turns at low speed. Such as pulling into or out of your camp site. This allows you to do tighter turns because the trailer is moved further away from the cab and it won’t hit.

Hopefully explained with this pic:

Diagram showing how a fifth wheel slider hitch allows the hitch to slide further to the back of the bed of the truck, allowing for tighter corners where the front of the trailer will not impact the truck cab.

You’ll see that the king pin ends up past the rear axle, but it’s fine because it’s only for a little while as you are completing the turn.

They come in either manual (where you have to get out of the truck and unlock the hitch before making your turn) or auto.

Gooseneck Hitch

A gooseneck hitch is where the hitch on the fifth wheel fits over a ball that sits in the bed of your truck.

This pic shows it quite well.

Diagram of gooseneck hitch

Although this next pic is low quality, it helped me to understand what these look like.

Trailer showing gooseneck coupler.


You are able to get adapters that turn a gooseneck to a fifth wheel, but that’s getting a bit more specialised, and every situation is unique. An adapter can change where the stressors are applied to the rig so it’s much more than just a simple ‘plug and play’ scenario. If you’re going to do something like that I think you’ll need to talk to a towing / truck / RV / fifth wheel specialist. i.e. not me.

So that’s just a brief overview of fifth wheel trailer hitches. Hopefully it’s given you a little bit of clarity about what they are and how they work.

Available on

Fifth Wheel Covers

Fifth Wheel Hitch

Back up camera & monitor

Fifth Wheel / King Pin Coupler Lock

If you're new to fifth wheel trailers it can be a bit confusing when you're thrown into a world of fifth wheel hitches, goosenecks and sliders. Here's the basics of what it all means. #fifthwheelhitches

Xtreme Trailers

Tuesday 18th of August 2020

Enjoyed reading the article above , really explains everything in detail and the article is very interesting and effective.Thank you for sharing

Tyler Johnson

Thursday 19th of December 2019

That's cool that you could get a trailer hitch that would sit in the bed of your truck. I like the idea of having a big trailer, and it looks like one of those would allow you to pull a taller one. If I end up getting a trailer, I'll have to look into getting something like that as well.

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