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  1. Tow Bar
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  5. Telescoping
  6. Hitch Mount Style
etrailer SD Non-Binding Tow Bar for Reese or Valley Base Plates - 2" RV Mount - 6K

etrailer SD Non-Binding Tow Bar for Reese or Valley Base Plates - 2" RV Mount - 6K

Item # e37ZR
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Tow Bar
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Product Expert Kristina F

Is this right For you? Product Expert Kristina F says:

Yes, if you:

  • Tow a Jeep, sedan, mid-size truck or SUV
  • Want the easiest hookup and disconnect possible
  • Like a sleek, sturdy design

No, if you:

  • Tow a larger car, truck or SUV - your loaded down vehicle may exceed the 6,000-lb weight rating
Flat tow your vehicle with the hitch-mounted etrailer SD tow bar. Independent, self-supporting arms won't fall to the ground when unfolded, and smooth operation allows for easy hookup and disconnect, even on unlevel ground. Built-in rise/drop. Lowest Prices for the best tow bar from etrailer. etrailer SD Non-Binding Tow Bar for Reese or Valley Base Plates - 2" RV Mount - 6K part number e37ZR can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (58)
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  • Why etrailer?

etrailer Tow Bar - e37ZR

  • Fits Reese Base Plates
  • Fits Valley Base Plates
  • Telescoping
  • Hitch Mount Style
  • 6000 lbs
  • etrailer
  • Non-Binding
  • Stores on RV
  • Steel

Flat tow your vehicle with the hitch-mounted etrailer SD tow bar. Independent, self-supporting arms won't fall to the ground when unfolded, and smooth operation allows for easy hookup and disconnect, even on unlevel ground. Built-in rise/drop.


  • Tow bar lets you tow your vehicle safely and securely behind your motorhome
    • Slides into trailer hitch receiver on RV - no ball mount necessary
  • Telescoping, self-supporting arms make for fast, easy hookup
    • Arms won't fall to the ground when unfolded
    • Full articulation allows for unlimited spread to fit your application
  • Self-aligning design - just hook up and drive RV forward
    • Arms extend into rigid, tow-ready position and automatically lock in place
  • Non-binding design allows you to easily release your vehicle, even on unlevel ground
    • Trigger release on each arm easily activates, even when under pressure
  • No need for high-low adapter on most setups
    • Adjustable head tilts up or down 3" to keep tow bar parallel with road during towing
    • Shank has built-in 1-1/2" rise or drop for additional adjustability
  • E-coat finish provides corrosion resistance
  • Integrated cable mounting clips keep included safety cables off the ground to prevent dragging
    • Vinyl-coated safety cables include steel S-hooks with spring-loaded latches for added security
  • Built-in storage rod keeps coiled electrical cord (sold separately) in place and off the ground
  • Simple, secure storage alongside motorhome
    • Arms can be folded up and stored to the left or to the right, or they can be folded out with 1 arm each way
  • Lifetime technical support from the experts at
  • Made in the USA


  • Compatibility: works with Reese or Valley Industries base plates
  • Application: 2" x 2" trailer hitch receivers
  • Arm length (from center of hitch pin hole at end of shank to center of base plate pin hole when lined up with arms straight):
    • Extended: 51-3/4"
    • Retracted: 39-1/4"
  • Distance between hitch pin hole at end of shank to beginning of curve in shank: 5-1/2"
  • Distance between hitch pin hole at end of shank to vertical bolt in head: 12-1/2"
  • Distance between hitch pin holes: 2"
  • Weight capacity: 6,000 lbs
  • Weight: 41 lbs
  • Lifetime limited warranty

Necessities for Flat Towing

For the RVFor the Towed CarTo Link the Towed Car and RV
HitchBase platesTow bar
Wiring plugBraking systemSafety cables
Wiring kit/diodesWiring adapter cord

Sturdy, Built-to-Last Tow Bar

The etrailer SD tow bar is tough and built to last. Sturdy, modular steel construction offers the strength you need to pull up to 6,000 lbs. Two hitch pin holes allow you to position the tow bar closer to or further from your RV, without sacrificing load capacity.

The black powder coat finish protects against the elements and flying road debris. And stainless steel inner arms provide additional durability and allow for smooth operation. Quality-engineered pivot points and hardware ensure both strength and maneuverability.

Fast, Easy Hookup

With independent, easy-to-maneuver arms, the SD makes connecting your towed vehicle to your motorhome a breeze. Unlike most tow bar arms that move together along a single plane, the SD tow bar arms operate completely separately from one another. A vertical bolt through the head of the tow bar keeps the arms positioned one on top of the other, allowing for a more fluid hookup. The arms pivot horizontally on this bolt, allowing for an unlimited spread so that you can hook up to base plates with almost any spacing. A built-in joint at the base of each arm allows for vertical movement so that you don't have to tilt the entire head when positioning the arms.

The arms telescope for easy extension to your base plate connection points, even if your towed car is not perfectly aligned with your RV. The self-supporting design of the arms also allows you to telescope one arm out and attach it to the base plate without having to worry about supporting the opposite arm at the same time. The arms lock into place when you're ready to tow, and the extra length of the arms allows for a better turning radius. By putting more distance between your motorhome and your towed car, your entire setup will become easier to maneuver so that your towed car will track behind your motorhome without running the risk of hitting your RV during turns.

Base Plate Connection

In order to be compatible with Reese or Valley Industries base plates, sturdy adapter brackets are included for compatibility with the ends of each tow bar arm. These clevis-style ends attach to the base plates using the included hardware and provide a tight, stable connection for a safer and more dependable towing experience.

Non-Binding for Simple Disconnect

The built-in trigger releases make it easy to disconnect the SD. Tension can build up in a telescoping arm when the RV and towed vehicle are not perfectly aligned. Engaging the trigger on each arm releases pressure and allows the arms to telescope freely, making it easy to disconnect the tow bar from the base plates, even if you are at a hard angle or out of level.

Each trigger release latch is positioned on the side of the tow bar arm. This allows for a comfortable yet firm grip, unlike latches that are positioned on the tops of tow bar arms, which can be difficult to grab. This out-of-the-way placement of the latches also creates a clean look for the tow bar.

Straight, Vinyl-Coated Safety Cables Included

Two straight, vinyl-coated safety cables provide added protection should the tow bar ever disconnect during towing. The cables are held off the ground by the included mounting clips. These clips keep the cables from dragging on the ground, preventing damage and tangling. Steel S-hooks with spring-loaded latches connect each cable to your towed vehicle's base plates and to your motorhome's trailer hitch.

The tow bar also offers a convenient storage rod for securing your coiled electrical cord (sold separately). The rod holds your power cord neatly out of the way and up off the ground.

Versatile, Secure Storage

Independent arm movement also allows for storage versatility. Easily store the tow bar out of the way, alongside your RV. The arms can be folded up to the right or to the left, or you can fold one arm to each side so that they are parallel to your motorhome's bumper. Just pivot each arm into position and a peg at the base of the arm will snap into a built-in tab, latching the arm in place so that you don't have to worry about it coming unfolded during travel.

For added protection, slip on the etrailer tow bar cover (e99008 - sold separately) while the tow bar is folded up either to the left or the right against your RV.

Guide to Flat Towing

Flat towing your vehicle is much more convenient than using a trailer or a tow dolly. These other options take up much more storage space, leaving you less room both at home and at the campsite. In addition, securing your vehicle to a trailer or tow dolly can be a hassle and more time consuming than hooking up with a tow bar.

There are 5 basic components needed when flat towing a vehicle: a tow bar, a base plate kit, a safety cable set, tow bar wiring, and a supplemental braking system.

Towing Basics

The tow bar links your towed car to your motorhome. It attaches to the custom-fit base plates that install on the frame of your towed car. Safety cables ensure that your towed car does not separate from your motorhome in the event that your tow bar becomes detached. Tow bar wiring allows your towed vehicle's signal lights to sync up with your motorhome's tail lights, which is required by law in most states. Finally, the supplemental braking system - also required in most states - brakes your towed car when the brakes in your motorhome are activated, preventing wear on the motorhome and decreasing braking distance for your entire setup.

etrailer Technical Support

At etrailer we're committed to the products we sell, and to our customers. Our experienced and knowledgeable staff are available via both phone and email to address your questions and concerns for the lifetime of your tow bar. The technicians at etrailer perform flat tow installations on a daily basis, making them a valuable resource for do-it-yourselfers. The one-on-one, personal service you'll receive comes straight from an expert in the towing and automotive field. We've installed it, we've wired it and we've towed with it, so whatever your question, we can answer it.

9998971 SD Tow Bar

9998977 Base Plate Adapter Kit - Reese Tow Champ and Valley Industries

Installation Details E37ZR Installation instructions

Video of etrailer SD Non-Binding Tow Bar for Reese or Valley Base Plates - 2" RV Mount - 6K

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

Video Transcript for etrailer SD Non-Binding Tow Bar Review

Hi there flat towers today, we're going to be taking a look at SD tow bar. This tow bar comes in various different kits with the ends that's necessary to attach to all the different base plates that are available out there. We're currently using the kit that has ends for etrailer or Demco base plates, but we also have kits available that we'll attach to Valley or Reese base plates, Blue Ox, or Curt base plates, Roadmaster base plates. There are two different kits for the crossbar style or the direct connect style, as well as Duncan base plates. You'll want to make sure that you get the appropriate kit with the ends that will attach to the base plate you're installing on your vehicle. Well, we've got our tow bar here in the storage position.

I did want to point out that it's doing something that none of the other manufacturers tow bars can do.One arm is completely off towards our passenger side while the other is completely off towards the driver's side, giving us a spread of 180 degrees. Many of the other manufacturers, tow bars, they can only spread so far before the arms will stop. And they have a limited amount of spread with this one, having the 180 degree spread the width for the base plate. Attachment points is much more variable on this one. So this is going to attach to just about any base plate out there.

Whereas the other manufacturers are limited depending on the width of the base plate tabs. Now on our Jeep here, it's not too big of an issue because these are pretty close together. But if you did have a larger vehicle like a, an F-150 or a Dodge Ram, where they have a wider base plate attachment point, you might run into some issues with some of the other manufacturers, tow bars.And it's just not an issue on these. Now, if you are towing a large truck or something like that, with the widespread, you do want to keep your weights in mind. This tow bar is rated for 6,000 pounds, but etrailer also has the XHD model, which is rated for 10,500 pounds.

So you are also going to be covered there in that one that has the exact same features here as the SD model. It's just with a much higher weight rating. Another thing that I really like about this tow bar, and for me, this is a big one. Cause I'm putting these in and out all day. We're doing videos and stuff like that.

And I know it's going to be pretty big for you guys at home. If you've ever messed with the tow bar before you know that they're pretty darn heavy.And once you get it in the receiver here, your work's not over. You still don't have to lift these arms up and get them attached to your vehicle. With this tow bar here, you only got to do the work to get it attached to your motor home. And in most cases you can just leave it stored back here at the back, just like it is when you're not using it. And whenever you are ready to use it, you don't have to fight the arms like the other manufacturers where you're holding those heavy arms up because we have nice tension here and the arm holds up right by itself. So there's almost no work in it. You can easily push this around, bring the arm down to line it up. It's just, couldn't be easier with a lot of those other ones. I mean, you're going to have to hold them up cause there's just no assistance.You're bearing the whole weight of it, trying to get these attached. But I mean, with this, it just glides right in and it really does make a huge difference. I mean, I'm putting these in and out all day long and it's just night and day on how I feel at the end of the day, messing around with this tow bar versus the competitors. When you're done using your tow bar, there is a storage position. You'll see a small tab here on top. And these yellow hooks on each side will help keep your arms up and you can put it on either side. I like to put one arm on each side and to store them, you just lift up on the arm to lower that pegged down, we'll twist it over and then we can lower our arm down and that will hold it in place. We're going to do the same thing with our other arm on the other side,And you can take your safety cables, and just wrap them around and clip onto each other to keep those up off the road. Now we've got everything connected here. I did want to point out something that our tow bar does come with and that safety cables. And that's pretty nice, especially since it has cable management here to hold everything up. One of my favorite tow bars from Roadmaster is the Falcon all-terrain. And I'd say that's a pretty good competitor for this one right here as the all-terrain does have channels in it for your safety cables, as well as your wiring. The Falcon all-terrain does not come with the safety cables. So you will need to make sure you purchase your own set. In addition, with those, the etrailer comes with it. So that's one less thing that you have to think about on the side here, our cable management on the etrailer, tow bar is going to be a rod here that allows you to put a coiled cable over it.You do want to keep that in mind when purchasing your cable. Cause there are a lot of styles here at etrailer, and I highly recommend a coiled cable with this tow bar. If you we're going with the Falcon, all-terrain that one in order to use its cable management, it would require you to have a straight cable in order to pass it through the channels. And with that, you also have to remove the ends from it, pass it through the channel and then reconnect it with this one. It's as simple as sliding the quilt cable over here and then securing it with the pin. So it's a little bit less work to get it set up, but non-binding levers on our each etrailer tow bar here. I personally find these to be a little bit easier than the Roadmaster ones. The lever here actually is this small tab here.And this is just kind of gives you a good place for the palm of your hand to really press in and dig in to get it to release. And it just feels smoother. Like it releases better than with the Roadmaster. The Roadmaster's are on top and they do have a longer lever. So you would think that it would be easier with that longer lever, but when you pull that lever up, you can kind of feel it pop, but it doesn't release until that lever is kind of halfway on its way back down. And it can just be kind of finicky, especially since you have to hold the weight up on that Roadmaster tow bar, while you're trying to do all this, this is just a little bit easier. You can kind of grab the bar. It's all one fluid motion. I just prefer this style.I think you'll find it easier as well and help protect your investment. Keep your tow bar out of the elements. We have a cover available here at and this is also nice when you're storing it on the back of your motor home. Cause you can keep all your cables and wiring and everything tucked up in this bag when you're not using it. And to ensure long life and high quality looks, there's an e-coat finish over it to protect it against the elements and prevent any rust or corrosion. I've also got some measurements for you here, so you can see the dimensions and how it's going to sit between your vehicle and your motor home. The arm length when retracted is going to be 39 and a quarter inch, and that's from the center of the hitch pin hole to the edge here. And when extended, it's going to measure 51 and three quarters of an inch.So you've got over 10 inches of travel on our shaft here, but we can make some small adjustments to that length here and our shank, where it goes into our receiver. There are two hitch pin holes. The first one I gave you is for the furthest hole, which is going to be the longest length, but you can cut that down by two inches by using the hole. That's slightly closer to our arms here. There's five main components you'll need when flat towing your vehicle, the tow bar being one of those. In addition to your tow bar, you're also going to need your safety cables, which is a supplemental connection. In addition to your tow bar, you'll also need your diode wiring, which takes the lighting from your motor home and sends it to the lights at the back of your vehicle, your base plate, which is the connection point on your vehicle for your tow bar and your safety cables to attach to. And lastly, your supplemental braking system, which will apply the brakes in your vehicle when you hit them in your motor home. And that completes our look at SD tow bar..

Customer Reviews

etrailer SD Non-Binding Tow Bar for Reese or Valley Base Plates - 2" RV Mount - 6K - e37ZR

Average Customer Rating:  4.9 out of 5 stars   (58 Customer Reviews)

Flat tow your vehicle with the hitch-mounted etrailer SD tow bar. Independent, self-supporting arms won't fall to the ground when unfolded, and smooth operation allows for easy hookup and disconnect, even on unlevel ground. Built-in rise/drop.

Ask the Experts about this etrailer Tow Bar

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    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
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  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
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    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video by:
Dustin K
Employee David F
Test Fit:
David F
Employee Kristina F
Written by:
Kristina F
Employee Michael B
Installed by:
Michael B
Employee Noah M
Updated by:
Noah M

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