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  1. Trailer Door Holders
  2. Polar Hardware
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  4. 4 Inch Hook
  5. Aluminum
  6. 2-5/16 x 1 Inch Hole Spacing
T-Style Hook and Keeper Door Holder for Trailer Rear or Side Door - 4" Hook - Aluminum

T-Style Hook and Keeper Door Holder for Trailer Rear or Side Door - 4" Hook - Aluminum

Item # PLR9-A
Our Price: $9.17
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Trailer Door Holders
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Use this low-profile hook-and-keeper door holder to keep your trailer door open while you're loading and unloading. Lightweight aluminum construction is rustproof and lasts longer than plastic holders. Mounting screws not included. Great Prices for the best trailer door holders from Polar Hardware. T-Style Hook and Keeper Door Holder for Trailer Rear or Side Door - 4" Hook - Aluminum part number PLR9-A can be ordered online at or call 1-636-306-4830 for expert service.
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Polar Hardware Trailer Door Holders - PLR9-A

  • Hook and Keeper
  • 4 Inch Hook
  • Aluminum
  • 2-5/16 x 1 Inch Hole Spacing
  • T-Style Hook
  • Polar Hardware

Use this low-profile hook-and-keeper door holder to keep your trailer door open while you're loading and unloading. Lightweight aluminum construction is rustproof and lasts longer than plastic holders. Mounting screws not included.


  • Hook-and-keeper door holder keeps your rear or side trailer door open while you're loading and unloading
    • No need to get a friend to hold the door or find something to prop the door open
  • T-style hook fits securely into the receiver slot to hold the door in place
  • Foldaway hook provides a clean look and won't get in the way
  • Aluminum construction is rustproof
    • Lasts longer than plastic and standard steel holders
  • Hook mounts to the door; keeper mounts to the side of your trailer
    • Mounting hardware not included


  • Hook length: 4"
  • Hook mounting bracket dimensions: 3" tall x 1-3/4" wide x 3/8" thick
  • Keeper mounting bracket dimensions: 3" tall x 1-3/4" wide x 11/16" thick
  • Distance between mounting holes (center to center) on both brackets: 2-5/16" horizontally; 1" vertically
  • Mounting hole diameter: 3/16"

9-A Polar Hardware Hold Tite Door Holder - Aluminum - 4" Hook

Video of T-Style Hook and Keeper Door Holder for Trailer Rear or Side Door - 4" Hook - Aluminum

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Polar Enclosed Trailer Door Hook and Keeper Review and Installation

Adam: Hi, everyone. Adam with Today, we're going to be taking a look at the Polar Hardware Hook and Keeper for your enclosed trailer doors. So, both of these brackets are going to be made of aluminum, so they're going to naturally resist against rust and corrosion. They're not going to be as strong as some of those stainless steel or zinc plated ones that we also offer, but they are going to be stronger than nothing, and of course a little bit stronger than plastic as well.This enclosed trailer specifically, and some of the others from the factory didn't really have a keeper for our door. So, there was a couple times we we're working on this doing a video, and it was hard to keep this door open.

So luckily with this, you can just mount it up pretty easily like that, and now we're going to have a nice little spot to hook this hook onto the keeper like that. And now we really don't have to worry about having that situation happen again. I used to literally just put a little bungee cord here and tie it off somewhere here, and it necessarily wasn't the best way to do it. This way, it's nice and mounted up. So once we're done, it's going to be just as easy to undo it too.

And this looks a little bit more professional, especially if you have a enclosed box trailer on a construction site, and it might even have a big wrap on the side of it with your business' name. We just want to make sure that we just have the proper equipment for our equipment, just so we look professional.The one thing I do recommend getting is some hardware that will fit your trailer. And also, we are going to use some butyl tape underneath here, just so when we do drill through, we can seal that up, just so water's not going to get into those holes we drilled. So, it isn't too difficult to get these installed. Yes, we've got to drill holes, but we'll go all over that in the install right now.

Our rod here is going to be about four inches, so first thing we need to figure out is make sure that our trailer door is going to be able to open up all the way. And of course, just make sure we have enough gap between here and our other bracket, and see if we're going to have the right amount of space for this to hook up properly.So I'm just going to find a little spot here. And as I open up this door, I want to make sure that we are going to have a good spot to put the other section so it will line up properly. So as I shut this door about here, and one thing we just need to make sure is we're going to have it in the right orientation as well, so it can make that contact. So as we kind of come in like this, my idea is just to kind of, as I'm opening that door, it's going to slide in there and obviously that it's going to be able to support it.

So, it is going to work, but I know I can get through this door, but I just want to make sure on the inside of the trailer itself, we're going to be able to get to the back of our bolts. So, this is where the bolts are going to come through, so we're good there. So now we'll go ahead, mark our marks, and we can start drilling this bracket to get this one installed first.I always just like to use a paint marker just like this. And we don't need a whole lot. I've seen enough just to know where I'm going to be going. So now, we just want to go ahead and pick our right drill bit. I'm using a 3/16ths inch drill bit, but we could go bigger or we could go smaller. It just depends on what kind of hardware you guys are planning on using. So, just grab that and then you can go ahead and start drilling away. Perfect. And then now we're hitting the wood, so I want to go a little bit faster. Awesome. And then we'll do the same exact thing for the other four holes we marked. So, when making any holes in our trailer here, what we want to do is use some butyl tape so that we can get all of that water from getting into those holes we drilled. This is just going to prevent any of that water getting down in there, rotting stuff out, and just causing unnecessary damage.So, this is what it'll kind of look like. You guys can do your own little twist to things if you want, but all we just want to make sure of is that it's going to cover the hole and we have a washer on the other end of our hardware here, because we will have to supply them for these brackets we're putting on. So with that into place, we can go ahead and try to get that lined up in the hole, just like that, get it all the way through. Then we'll do that same exact thing for all of our other bolts. So, we did have to source our own hardware for this, like we said earlier, but what you guys need to remember when picking these is first, we just need to make it small enough to go through the bracket. And second, I do suggest going all the way through and then putting a nut on the inside. If you're just self-tapping on the outside of these enclosed trailers, eventually you're going to see some flex in that outer paneling. This is just going to be the better overall way to do it with our enclosed trailer here.So now we're going to go ahead and put our nuts on one side like this. We're going to do that for all of them, and then we'll go around front and tighten them all down. So, by going all the way through and putting a bolt on the back end, we don't have any flex. This bracket is completely solid. If we just used self-tappers, which I recommend not doing, we would see a bunch of different flex of this outer shell here. But with this, it's good. And if you guys get a little bit closer, you guys can see how that tape is making that seal really nice. You can either maybe cut off all the excess or just kind of work it with your hands and kind of just get it into that groove a little bit more, but we won't have any issues with any water getting into these holes, and that is exactly what we are looking for.So, when we are putting the second bracket on, it's going to be extremely important to line it up properly as we kind of move this in. This is pretty much where we want it. So, right about there. But we do got to remember too, we are going to have to pull it in a little bit more just to get that undone, and we will have a little bit of play up and down. So, that'll give us a little bit more wiggle room. I think this is where we're going to do it, and we can go ahead and take a marker, and we'll mark it up. And now, we can get to drill it. You guys know the drill. Put some tape over top of it. We're going to get our bolt, push it through. Get a washer, and once we get all these lined up, we're going to go ahead and just put some nuts on the back, and then just tighten them up just like before.So, once you have everything mounted down correctly, we just want to make sure that it lines up properly. And if it does, and it does, we're pretty much good. Now we can be able to keep this door open and not have it slam shut on us, and that's happened a couple times to me. But other than that, that's pretty much all there really is for the Polar Hardware Hook and Keeper for your enclosed trailer doors.

Customer Satisfaction Score:

Customer Reviews

T-Style Hook and Keeper Door Holder for Trailer Rear or Side Door - 4" Hook - Aluminum - PLR9-A

Average Customer Rating:  4.8 out of 5 stars   (62 Customer Reviews)

Use this low-profile hook-and-keeper door holder to keep your trailer door open while you're loading and unloading. Lightweight aluminum construction is rustproof and lasts longer than plastic holders. Mounting screws not included.


I bought this to replace my Escape 17B travel trailer’s original plastic hook that became brittle and then broke several years ago. Easily installed using a cheap rivet gun I bought from Walmart. The hook’s and keeper’s lower two holes of the four holes for riveting did not exactly match the original holes of the broken plastic so I had to drill a little, but it’s not a problem. It looks so good on my fiberglass travel trailer. Excellent product from Thanks a lot etrailer!


Like most any lock they can be a little temperamental after being out in weather a while, but a shot of lock lube or WD40 takes care of that. "Training the lock to your given key is a breeze, and I definitely like the convenience of not having to try and recall which key is needed to use them!


These are perfect for securing open the heavy steel doors on a large storage shed. Effectively stops the wind caused slamming of the doors. Easily installed with 3/16" dia. pop rivets for a smooth tamper-free finish. Light weight non-rust aluminum. Thank you!


Ordering was quick and easy same as the install and works great to. Delivery was sooner then expected. Very happy ordering from etrailer!

Still works ad looks like it did when I received it a year ago.
Joseph C - 08/04/2021


Quality made very sturdy. Will last for years to come.



Still 100 confident. Product looks brand new and functions flawlessly.
WARREN L - 04/24/2021


These replaced the old rubber ones. I love these. They work great on the horse trailer.


Fast delivery
Quality parts


I recently bought a used toyhauler that needed a latch type door holder (this thing)—works perfectly. But even more, etrailer is now my go-to source for all trailer parts. This is my 2nd or 3rd order. Each time my experience ordering online has been excellent.


Came super fast and product was exactly what I wanted! Customer for life!! Thanks!


Love received my products that I ordered fast and they were excellent quality. If and when I need anything else I will definitely be ordering from here.


The product fits and works perfect !! They are a whole lot better than the ones that came with the trailer. Took about 5min. to install.


very well made product - meets my expectation - I am going to use this to hold the side door open on my metal shop

The door keeper is working great - no worry about wind blowing door shut
DIY - 07/25/2020


I will say this was a very pleasant
I was well informed and updated with the shipping information
and notified when items were shipped and everything arrived in two days. I
highly recommend etrailer to anyone requiring your products and I will
definitely be using etrailer in the future for my trailer and RV needs.


Screws too long and snap easily, otherwise a great product. I pop-riveted the pieces to the trailer, no other issues.


My original door stops were broken so ordered these. Looks just like original ones and works great


Everything I have ever purchased from etrailer has been great the prices are very good shipping is excellent


Keeper was flush mounted and did not line up with hook correctly. I had to use washers to bump out one side to make it work, but it does work.


This little gadget is just what I needed. Easy to install and works perfectly to hold my enclosed trailer door open.


Great Product, etrailer's customer service is excellent


Works ok. Tip. Put the door side on first. It's nice to be able to keep the door open.


Product is working as expected. Good to do business with.




easy installation. High quality produc t.


Excellent product, excellent service.

Show More Reviews

See what our Experts say about this Polar Hardware Trailer Door Holders

  • Installing Hook and Keeper for Trailer Door
    As you may expect, it would not be possible for me to tell you exactly what somebody else was talking about, and I would only be able to tell you about the products we carry. For example, if you use the Hook and Keeper # PLR9-A you would install either side with eight #10 mounting screws. I have added a link to a video review of this part for you to check out.
    view full answer...
  • Solution to Hold Swinging Trailer Doors Open
    What we have is a Hook and Keepr # PLR9-SS in stainless steel, # PLR9-A in aluminum, and # 383400 zinc plated. These are used to hold trailer doors open similarly to how you are using a hook and chain. One piece is conneted to the side of the trailer and the other is connected to the door. The hook slides inside of the keeper when open to hold the door in place.
    view full answer...
  • Door Keepers for Enclosed Trailer Doors
    We only have the door keepers available in 4 inch. We have the stainless steel # PLR9-SS, Aluminum # PLR9-A, and Zinc # 383400. We also have some plunger and socket and stem and socket options, but these have less space. I've linked the page to further assist.
    view full answer...
  • Is the Hook and Keeper for Enclosed Trailer Door PLR9-A Spring Loaded
    The Hook and Keeper for Enclosed Trailer Door part # PLR9-A are not spring loaded. That said, we do have spring loaded options like the 45-Degree T-Style Hook and Keeper Door Holder for Enclosed Trailer part # 37211765. We don't have any straight spring loaded hook and keepers unfortunately.
    view full answer...

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Info for this part was:

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Employee Cole B
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Installed by:
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Employee Adam E
Installed by:
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Employee Chris R
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