Does a spray-in bed liner cover the fifth wheel puck holes?

Not if it was done properly. A professional liner shop pulls the caps out, plugs or tapes off the five holes, sprays the liner around them, then pulls the masking material and puts the caps back in. The finished bed has the pucks sitting right there in a clean opening, fully usable. Spray-in material only ends up on top of the caps when somebody skipped that step — a rushed shop or a DIY kit sprayed straight over the bed floor.

How do I find the fifth wheel prep package on an F-350 that has a spray-in bed liner?

Start by just looking. On a properly sprayed truck the five caps are visible in the front half of the bed floor, four in a rectangle plus one in the center, sitting in openings the installer masked off. If you genuinely cannot see them, you are in one of two situations: the liner job was done badly and sprayed over the caps, or the truck never had the prep package. The fastest way to tell those apart is to look for a 7-way trailer plug inside the bed — every factory puck installation includes one, so no in-bed 7-way means you almost certainly never had the prep.

How can I tell whether my truck has the hidden mounting holes under the liner?

First check whether they are hidden at all — a proper spray-in job leaves them exposed. If nothing is visible, check for a 7-way trailer connector mounted inside the bed, because factory puck installations always include one. Then look under the truck between the frame rails ahead of the rear axle for the heavy factory bracing that the holes bolt through. If that structure is there you have the prep and a bad liner job is covering it; if it is not there, the holes were never cut. Your VIN read against the build sheet at any dealer settles it for free.

Where do I drill for the fifth wheel prep package if I have a bed liner?

You don't. If your truck has the factory prep there is nothing to drill — the holes were cut and the under-bed brackets installed at the factory. At worst you are cutting a thin skin of liner off the top of a cap that somebody sprayed over. If you genuinely need to drill, you do not have the factory prep and you are installing an aftermarket rail or under-bed kit, which ships with its own template. Confirm which situation you are in with your VIN before any tool touches the bed.

Would an F-450 have holes in the bed if it were not fifth wheel prepped?

No. A truck without the prep package has no holes at all — not hidden ones, not covered ones, none. The prep is an option rather than standard equipment on every trim, so two otherwise identical trucks can differ. If there is no under-bed structure and no in-bed 7-way plug, the holes were never there. That is not a dead end: an aftermarket rail kit or under-bed gooseneck kit gives you the same drop-in setup.

What is the factory prep package called on the window sticker?

Ford lists it as the 5th Wheel/Gooseneck Hitch Prep Package. Ram calls it the Fifth Wheel/Gooseneck Prep Group, sales code AHU. GM calls it the Gooseneck/5th Wheel Prep Package, RPO code Z6A, which appears on the glovebox RPO label. Window stickers are occasionally wrong or missing, so the build sheet read from your VIN is the authority.

Somebody sprayed over my puck caps. Can I get them back?

Usually yes. Locate all five caps, then score around the edge of each one with a sharp utility knife and work outward from the center, cutting only the circle of the cap rather than a large square so it still seats flush afterward. Spray-in material bonds to the cap edge, so gentle heat and patience beat force — prying hard cracks caps and replacements are not free. A liner shop will open them up for you cheaply, and a good one will be embarrassed enough by the original work to do it carefully.

Finding Your Prep Package Under a Bed Liner

Written by a towing industry expert Updated September 2026

The short answer: A real liner shop pulls the caps, masks the holes and sprays around them — so your pucks should be in plain sight. Can't see them? Check for the in-bed 7-way plug.

The 2-Minute Answer

Here's the thing nobody tells you: a properly sprayed bed liner doesn't cover your pucks at all. The shop pulls the caps, plugs the holes, sprays around them, pulls the plugs, and puts the caps back. You end up with five clean openings you can see and use.

So if you can't find yours, it's one of two things — a bad liner job that sprayed straight over the caps, or you never had the prep package. The five-second way to tell them apart: look for a 7-way trailer plug inside the bed. Every factory puck installation comes with one.

How a Real Liner Shop Does It

Which is why "hidden under the liner" is mostly a myth

Spraying a prepped bed is a known job and any shop that does trucks has done it a hundred times. The sequence:

1. Pop the five caps out and set them aside.
2. Plug or tape off the open holes so nothing gets sprayed down into the brackets below.
3. Spray the liner around them. The material stops at the edge of each opening.
4. Pull the masking back out once it's cured.
5. Put the caps back in. Done — the pucks work exactly as they did from the factory.

So before you go hunting: just look at the bed floor. Front half, five round caps, four in a rectangle plus one in the middle. On most trucks with a liner they're sitting right there in plain sight.

Can't See Them? Two Possibilities

And they need completely different responses

1. Bad liner job

Somebody sprayed over the caps instead of masking them. The caps sit proud of the sheet metal, so the liner bulges over each one — run your palm across the front half of the bed and you'll feel five raised circles. A flashlight laid flat on the bed floor makes them throw shadows. The holes underneath are untouched and full depth.

2. No prep package

Nothing to find. A truck without the prep has no holes at all — not hidden, not covered, none. This is the more common answer, and no amount of searching changes it.

The plug tells you which

Every factory puck installation includes a 7-way trailer connector inside the bed, normally on the driver's-side wall near the front — it's there because a gooseneck or fifth wheel umbilical has to reach it from the middle of the bed, not the bumper. No liner can hide it. No in-bed 7-way, almost certainly no prep package.

It doesn't prove the reverse, though — a previous owner can add a plug, and some tow packages include one without the bed structure. Treat it as a strong hint, then confirm.

And Stop Looking for "Drill Points"

The question that gets asked wrong

If your truck has the factory prep, there is nothing to drill. The holes were cut and the under-bed brackets installed on the assembly line. Worst case you're trimming a skin of liner off a cap somebody sprayed over — that's a utility knife job, not a drill job.

If you genuinely need to drill, you don't have the factory prep, and you're installing an aftermarket rail or under-bed kit — which ships with its own template. Use it.

Settle this before a tool touches the bed

People put holes in perfectly good prepped beds every year. Two minutes with your VIN prevents it. Work out which situation you're in first.

Other Liner Types

Drop-ins are the ones that actually hide things

Drop-In Plastic

This is the real hiding case. Most have molded cutouts over the pucks, but plenty don't — and the liner just sits on top of everything. It lifts out in a couple of minutes. Pull it and look.

Bed Rug / Carpet

Easiest of the lot. Peel a corner back. Nothing is bonded to anything.

Watch Out For Dimples

Some drop-in liners have decorative molded indentations that look like capped pucks. Press one — if it flexes, it's plastic with nothing underneath.

Look Underneath

Works regardless of liner. Get under the truck and look between the frame rails ahead of the rear axle. Heavy factory bracing against the bed floor means the holes are directly above it. No bracing, no prep.

The Check That Can't Be Wrong

Free, two minutes, no crawling around

Call any dealer's parts or service desk, give them your VIN, and ask whether the truck was built with the fifth wheel / gooseneck prep package. They read it straight off the build sheet. That's the end of the argument.

If you'd rather check paperwork yourself, here's what it's called:

• Ford — "5th Wheel/Gooseneck Hitch Prep Package"
• Ram — "Fifth Wheel/Gooseneck Prep Group", sales code AHU
• GM (Chevy & GMC) — "Gooseneck/5th Wheel Prep Package", RPO Z6A on the glovebox label

Window stickers go missing and occasionally disagree with the truck. The build sheet doesn't. Exact spacing by make, year and bed is in the puck system dimensions guide.

Getting Sprayed-Over Caps Back

Only if you're in the bad-liner-job case

Find all five and confirm the prep on your build sheet before cutting anything. Then:

1. Score around the edge of each cap with a fresh utility knife blade, working outward from the center.
2. Cut only the circle of the cap — not a big square. You want it to seat flush again when the hitch comes out.
3. Spray-in material bonds to the cap edge. Gentle heat and patience beat force; prying hard cracks caps, and replacements aren't free.
4. Not confident? A liner shop will open them up cheaply — and a good one will be annoyed enough at the original work to be careful about it.

Getting a bed sprayed soon and you have pucks? Say so when you book it. A shop that knows going in will mask them properly and you'll never have to read this section again.

Turns Out You Don't Have It

Not a dead end

The factory prep can't be retrofitted — that structure goes in at the plant. But an aftermarket rail kit or under-bed gooseneck kit gets you the same drop-in convenience, bolted to the frame instead.