OEM vs Aftermarket on Work Trucks: Head Units, Backup Cameras, and Polish

Before anything else: this is about Hertz car audio — the Italian brand that builds speakers, amplifiers, and DSPs for the car audio trade. If you landed here searching for hertz pick up truck rental or hertz car rental lax, you're after the rental company. Same name, different business. We don't do rentals.

I'm the procurement manager at a 40-person vehicle upfit shop. I've run our parts budget — roughly $180,000 a year — for six years, negotiated with 30-plus vendors, and logged every order in our cost tracking system. Not a brag. It's the only reason the numbers below mean anything.

Every fleet customer asks the same question: OEM part from the dealer, or the aftermarket equivalent? It sounds like a price question. It isn't.

I compare four things, every time:

• Landed unit cost — the part, plus every adapter, harness, bracket, and module that isn't in the quote
• Labor hours — ours, not the vendor's estimate
• Failure cost — what happens in month 14, not month 1
• Acceptance — whether the fleet manager or the lease company signs off without a fight

Three categories come up constantly. Here's each one, side by side.

Dimension 1: Double-DIN touchscreen head units

In early 2024 we quoted a batch of aftermarket double din touch screen car stereos against the dealer's factory replacement unit.

Aftermarket: $180 a unit. Dealer: $420.

I nearly wrote the PO that afternoon. Then our lead installer asked me one question — which dash kit, which harness, which steering wheel control module?

Right. None of that is in the $180.

Totaled up — dash kit, harness, SWC interface, antenna adapter, and a retention module so the factory amp would still talk to the new radio — the aftermarket build landed at $351 a vehicle. Plus roughly 1.5 hours of extra labor over the factory unit, which plugged into what was already there.

So the $240 gap I thought I'd captured was $69. Per truck. Across twelve trucks that's still real money, but it's a very different number from the one I almost put in the budget request.

Here's where it got interesting, and where I was wrong.

I expected the factory units to be more reliable. They weren't — over two years, both options failed at roughly the same rate. What differed was what happened when they failed. A factory unit goes back through the dealer and comes out the other side without an argument. An aftermarket unit under a one-year parts warranty means we eat the removal labor, the reinstall labor, and the downtime. That's about $280 in our own shop time per failure, and the warranty doesn't cover any of it.

Same failure rate. Different cost of failure. That's the part nobody quotes you.

Verdict: on sticker price, aftermarket wins by a mile. On landed cost it's close — $351 vs $420 before labor. On cost of ownership over three years, the factory unit wins on anything still under manufacturer warranty, and the aftermarket unit wins on trucks we plan to run until the wheels fall off.

Dimension 2: Rear view cameras and the 95766-J7000 problem

Rear view camera 95766 j7000 is a factory part number you'll see on a lot of late-model Kia and Hyundai vehicles, usually bundled with the tailgate handle assembly. The dealer quoted us $389 for the camera and bracket in Q4 2024. The aftermarket equivalent was $54.

If I remember right, we priced three aftermarket cameras that week and two of them were under $60. This looked like the easiest win of the quarter.

It wasn't, for three reasons.

One: the connector. The factory camera uses a keyed connector with a specific pinout. Most aftermarket cameras ship with bare leads or an RCA pigtail. Fifty-four dollars becomes $54 plus a $22 adapter cable plus 25 minutes of a technician's time on a bench, splicing and heat-shrinking.

Two: latency. Nobody warns you about this one. Shift into reverse and a good factory camera is live before your foot is off the brake. The cheap aftermarket unit we tested lagged by close to half a second. Half a second at parking-lot speed is a lot of bumper.

Three: the guidelines. Factory cameras draw their dynamic parking lines from the steering angle sensor. They move when you turn the wheel. An aftermarket camera doesn't know the steering angle exists. You either give up the moving lines entirely, or you need a head unit that generates them — and most inexpensive double-DIN units don't.

Verdict: for a vehicle under warranty, on a lease, or heading back to a fleet manager who will notice missing guidelines, buy the factory camera. For a 2011 work truck out of warranty, buy aftermarket and budget to replace it every three or four years. That's not a downgrade. It's just the honest lifecycle.

Dimension 3: How to make liquid car polish at home — versus buying it

This one isn't our department, but it comes up because customers ask about it while they're standing in our bay. So I'll treat it as a procurement problem, which is what it is.

Most home recipes for liquid car polish come down to three ingredients: a carrier oil, a mild abrasive, and something to make it spread. Typical versions use baby oil or mineral oil, baking soda or fine cornstarch, and a splash of water or glycerin. You can mix a 12-ounce batch for under $10, and it'll look great on the hood for about ten days.

Does it work? Partly. The oil fills fine swirls and makes the paint look wet. What it doesn't do is cut. Real polish works because the abrasive is graded — consistent particle size, consistent hardness, predictable cut. Baking soda isn't graded. You get some polishing and some scratching, and you don't get to choose which.

There's a bigger problem, and it cost us money. Lots of home recipes lean on silicone-based oils, because silicone is what makes paint look wet. If that panel ever needs a respray, the body shop has to strip the silicone before anything will adhere. I watched a $9 homemade batch turn into a $310 prep charge on one of our trucks. That was a fun conversation.

Cost, honestly:

• Homemade batch: about $8-10 per bottle, plus your afternoon
• Commercial liquid polish: $15-30 per bottle
• A detailer doing a full polish: $150-300 per vehicle, depending on size and condition

Verdict: homemade makes sense on a truck you're about to wholesale, where the goal is "looks better than it did." For anything a customer will inspect under shop lighting, the commercial bottle is cheaper than the redo. And if the paint is genuinely oxidized or scratched, neither one is the answer — that's a machine polish, and that's a detailer's job.

Where I draw the line, and why that's the point

Which brings me to something I've changed my mind about over six years.

When we started, I wanted us to be a one-stop shop. Audio, cameras, tint, polish, whatever walked in the door. I assumed that's what customers wanted.

It isn't. The vendor who told me "this isn't our strength — here's who does it better" got every other order I've placed since. I'd rather work with a specialist who knows their own edges than a generalist who says yes to everything.

So here's our version. We're a Hertz car audio dealer. Speakers, amplifiers, DSPs, integration, head units, backup cameras. That's the work we're set up to do well. We are not a body shop, and we don't do paint correction. When a fleet customer asks us to handle polish and correction, I hand them two detailers' numbers and tell them to call me when they're ready for the audio side.

I could subcontract it and mark it up. Plenty of shops do. It works right up until the customer blames you for someone else's work. That's the most frustrating part of this industry — you'd think ten years of "we don't do that" would stop people from asking, but it doesn't.

Anyway. Being clear about what we don't do is the fastest way to be believed about what we do. That took me four years and a couple of uncomfortable conversations to figure out. One of my biggest regrets is not learning it sooner — I'd have saved a lot of goodwill.

Actually, not a couple of conversations. One really bad one. The rest were fine.

What I'd actually pick

Short version, depending on what's in your bay:

• Vehicle under manufacturer warranty, or on a lease: factory parts. Head unit, camera, all of it. The dealer warranty process is worth more than the savings.
• Work truck you'll run into the ground: aftermarket double-DIN and an aftermarket camera. Buy the $54 camera twice rather than the $389 camera once.
• Shop doing single-vehicle retail jobs: aftermarket, but quote the adapters and modules as separate line items. Customers still approve — they just don't feel ambushed later.
• Cosmetic upkeep: commercial polish for anything customer-facing. Homemade for beaters.

Pricing here comes from quotes we pulled between Q4 2024 and Q1 2025, in the US. Parts prices move, and cameras move faster than anything else in the category. Verify current numbers before you put them in a budget.

And if you came here looking for a Hertz pickup truck rental, I genuinely can't help you. Different company. We just spell it the same way.