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  1. Trailer Hitch Ball Mount
  2. Weigh Safe
  3. Adjustable Ball Mount
  4. Fits 3 Inch Hitch
  5. Drop - 6 Inch
  6. Rise - 7 Inch
Weigh Safe Hitch w/ Built-In Scale for 3" Hitch, 6" Drop/7" Rise, 21K, Aluminum
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Weigh Safe

Weigh Safe Hitch w/ Built-In Scale for 3" Hitch, 6" Drop/7" Rise, 21K, Aluminum

Part Number: WS36ZR
In Stock
$419.00
Trailer Hitch Ball Mount
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Here's your versatile solution for safe towing! This aluminum hitch has a built-in gauge for measuring tongue weight, comes with two stainless steel tow balls that swap out easily, and includes locking pins to keep everything securely attached. Great Prices for the best trailer hitch ball mount from Weigh Safe. Weigh Safe Hitch w/ Built-In Scale for 3" Hitch, 6" Drop/7" Rise, 21K, Aluminum part number WS36ZR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Weigh Safe Trailer Hitch Ball Mount - WS36ZR

Highlights

  • 21,000 lbs GTW for Big Loads: Handles heavy trailers, campers, boats, and equipment haulers.
  • Built-In Tongue Weight Scale: Shows load instantly so you can balance your trailer before towing.
  • 6" Drop or 7" Rise for Level Towing: Adjust height to keep different trailers level and stable.
  • Dual Balls for Multiple Trailers: 2" (10,000 lbs) and 2-5/16" (21,000 lbs) balls cover most coupler sizes.
  • Locking Pins for Secure Setup: Included keyed-alike pins deter theft and hold parts firmly in place.
  • Aluminum and Stainless Build: 6061-T6 billet shank with stainless balls resists corrosion and stays light.

Features to know about

Checks Load Balance Instantly: Built-In Tongue Weight Scale

A balanced trailer makes all the difference when you’re hauling heavy gear. This hitch has a built-in gauge that shows your tongue weight the moment you couple up, no extra tools or scales needed. You see right away if your setup is dialed in before you ever hit the road. It’s a simple way to tow safer and smoother every time.

Levels Out Every Trailer: Adjustable 6" Drop and 7" Rise

Different trailers sit at different heights, and this mount makes it easy to match them without carrying extra parts. The 6061 T6 billet aluminum shank lets you slide the ball platform up or down in 1" increments and lock it in place with the included keyed-alike dual pins. Whether you need up to a 6" drop or a 7" rise, your trailer stays level and stable behind you.

Built for Heavy Loads: 21,000 lb Rating on the 2-5/16" Ball

Big campers, work trailers, and boats all demand serious strength. The stainless-steel 2-5/16" ball handles 21,000 lbs gross towing weight, while the 2" ball is rated at 10,000 lbs with a maximum tongue weight of 2,200 lbs. That means one mount can cover both heavy hauls and lighter runs without swapping hardware.

Solid and Secure: Precision Aluminum Construction with Locking Pins

Every piece of this setup feels tight and solid. The hitch body is machined from a solid block of 6061 T6 aluminum that stays strong yet light enough to handle easily. A locking hitch pin secures the shank to the receiver, and keyed-alike dual pins hold the platform in place. Stainless-steel hitch balls resist corrosion for long-term reliability in any weather.

One Mount for Multiple Trailers: Two Ball Sizes Ready to Go

Switching coupler sizes doesn’t have to slow you down. This mount includes both a 2" and a 2-5/16" ball that change out in seconds—just pull the retaining pin, drop in the other ball, and you’re set. It’s quick, secure, and keeps your towing setup flexible for whatever trailer you’re hauling next.

Specs

Application

  • Application: 3" x 3" trailer hitch receivers

Weight and Capacity

  • Gross towing weight (2-5/16" Ball): 21,000 lbs
  • Gross towing weight (2" Ball): 10,000 lbs
  • Maximum tongue weight: 2,200 lbs

Dimensions

  • Distance from center of hitch pin hole to center of hitch ball (closest hole): 8-1/2"
  • Distance from center of hitch pin hole to center of hitch ball (farthest hole): 9-5/8"
  • Maximum drop: 6"
  • Maximum rise: 7"
  • Incremental height adjustment: 1"

Warranty

  • Limited lifetime warranty

WS6-3-KA Weigh Safe 6" Drop Hitch w/ 3" Shank (10K/21K GTWR) w/ Locking Hitch Pin





Video of Weigh Safe Hitch w/ Built-In Scale for 3" Hitch, 6" Drop/7" Rise, 21K, Aluminum
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of Weigh Safe Built In Scale Hitch 2 Stainless Steel Balls 3 Inch Receiver - WS36ZR

Hi, everybody, Andy here with etrailer.com. Let's take a look at this Weigh Safe built-in-scale with two stainless steel balls for your three-inch hitch receiver. Now this ball-mount is going to slide into your three-inch hitch receiver and give you two-inch and 2 5/16th-inch stainless steel balls that are gonna allow you to easily change the ball size for your tow needs. And this is also going to give you a six-inch drop in this orientation, so maximum of six-inch drop. And then when you flip this shank over, you'll get a maximum of seven-inch rise and you'll have incremental adjustments of one inch. So this is gonna give you that height adjustability that you're looking for so you can tow trailers of different heights with the same vehicle.

Now, when you use the 2 5/16th-inch hitch ball, you're gonna get a gross-towing weight of 21,000 pounds. With the two-inch ball, you'll get a gross towing weight of 8,000 pounds and this has a maximum tongue weight of 2,200 pounds. And, so, this does feature a tongue-weight scale that is built into the ball-mount platform that's gonna help you balance your trailer for safer towing. The scale is gonna let you know if your load needs to be adjusted before you tow. It's gonna be a very simple operation.

This will automatically provide a measurement for you every time you couple your trailer. So, it's efficient, it's hassle-free, it's going to eliminate the need for a separate or commercial scales. This also features this dual-pin slider lock that's going to make adjusting the hide very simple. So let me remove this black rubber cover here that's used to protect that keyway there. And I'm gonna take one of the keys here and just slide that key in, give it a turn.

And then that's going to allow me to easily remove this dual-pin slider lock. I wanted to point out that our pins and the housing are aluminum and then our lock here is plated steel. So this is gonna be, also, very durable and hold up really well against corrosion. And, so, as you can see, (metal scrapes) you're gonna be able to slide this up and down very easily to get that height adjustment that you're looking for. And I also wanted to show you just how easy it is to swap out the ball.

So, I'm using my 2 5/16th-inch ball right now. So I'm just gonna tip this over and you can see that ring there. So, sometimes that pin will just slip out. If it doesn't, you can just use that ring there and pull that pin out, just like so. And then that's going to allow me to remove the 2 5/16th-inch hitch ball. And then I'm gonna slide in the two-inch ball, I'm gonna line up the holes here, (metal scrapes) just like that. And then let me go ahead and slide this pin back in. And then I'm just gonna make sure that that ring is flush. And then I'm gonna bring my shank back in here. (metal clangs) And then just as easy as that, I'm on to my two-inch ball. And then let me go ahead and replace the pins here. Just line up the holes. And I hope you notice just how smooth everything works. You're not gonna be struggling at the back of your truck to make those adjustments. I'm really pleased with just how smooth everything slides in and out of place and, so, no problem whatsoever. It's gonna be very quick to adjust. Now this also does come with a locking-hitch pin. You do get four keys here and all four of these keys are keyed alike, so the idea is you can use one key for the dual-pin slider lock and then the same key for our hitch lock here. So I'm just gonna open up this cap here that's gonna protect that keyway, slide the key in, and that's gonna allow me to unlock it just like that. And then I wanted to show you what I really like about this hitch lock, I'm gonna turn that key back to the lock position, remove the key. You can lock this without having to keep the key inserted into that lock. So, once you get your hitch into place into your hitch receiver, you're just gonna slide this through and then that's just going to lock just like that without the key. So, saves time, very convenient and I really do like that feature. Some locks you have to keep the key in. That's not the case with this. So, this hitch is constructed of aircraft-grade aluminum. It's gonna give you that superior strength and durability. The solid-lock construction gives you greater strength than some hollow steel options, while also maintaining a light weight. This is gonna be rust-proof for a clean finish that's gonna stand the test of time. This is gonna be great for trailers that are used around the water, such as your boat trailers. You're not gonna have to worry about rust or corrosion with this. So, let me give you some measurements before we wrap up our time together. Measuring from the center of our first hitch-pin hole to the center of the ball, we're sitting at about 8 1/2 inches. If you move to the center of the second hitch pin-hole, 9 5/8 inches, and then from the center of the second hitch-pin hole to the end of the shank, about 1 7/8 inches. This is V5 and J684-certified. And I think that's gonna wrap up our look today. I do hope that it was helpful for you. Again, my name is Andy, thank you for joining me.

Customer Satisfaction Score:

Ratings & Reviews

4.9

130 reviews
5 Stars
(123)
4 Stars
(1)
3 Stars
(3)
2 Stars
(2)
1 Star
(1)
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I was very pleased with the fit and finish of the Weigh Safe hitch and scale. I also purchased a standalone tongue weight scale and was happy to see both of them give me very identical readings. I would like to see an additional pin on the height adjustment pin so it’s not relying solely upon the key lock. I would certainly recommend this hitch for someone that wants to know their trailer tongue weight. Will definitely cut down my trips to the CAT scale and provide a more accurate measurement. I can also move weight around and see direct results on the tongue.
by:
I downloaded the APP. It took me awhile to figure out how the App work. I think I have it figured out now. It would be nice to give a QR code to a video on how the APP set up works. The Hitch overall is made very well.
by:
It's a beast! Heavy duty and everything fits together perfectly. Can't wait to haul my camper with it and see what my actual tongue weight is.
by:
Received my new hitch today and can’t be happier with the build quality. Excellent customer service! Can’t wait to test it out on our next trip.
Lazer S. profile picture
Etrailer Expert

Lazer S.

1/27/2026

Glad you like it, JT! What is the next trip you have planned?

by:
I use this to haul a car on a trailer with my Rv and tongue weight is very important because I don't want to flex the frame, my rv has a very long distance from the axel to the bumper. And with this hitch I am able to place the car on the trailer and know the tongue weight for each position I put the car in. I was able to level the trailer as well. This hitch is well made.
by:
The weight scale is not registering the tongue weight. It stays on zero.
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I've used this for 12 months on a wide range of trailers 3000-15,000# and it's a great product. At the Cat Scale last week I checked the tongue weight at 1300# on the gauge and it was correct. The range of heights is great with trailers from car carrying box trailer to very tall ag trailer, it works with my 1 ton for all. The light weight makes it easy to mount and dismount 1 handed.
by:
I am really impressed with the quality of the Weigh Safe. Although I haven’t used it yet I think it will perform better than my last hitch that almost failed. I will update after I use it.
Mike L. profile picture
Etrailer Expert

Mike L.

8/17/2026

Please do, we'd love to hear what you think!

by:
No complaints ! Everything from before purchase, to using the hitch has been how all of American business should operate. Thank YOU
by:
I haven't towed with it yet, but out of the box very impressed. It weighs in at approx 18 lbs, so rugged. Using on a 2022 RAM 2500. I was concerned because some drop hitches don't fit well in RAMs due to the rounded corners in the receiver. This one fit perfectly. Shipping was great. Packaging was great. I expect it will tow just fine.
by:
Great product and easy to use. Takes the guess work out of calculating the tongue weight.
by:
The hitch is very high quality, no questions it’ll take the full 12,500lbs is rated for. etrailer customer service and shipping is another story, arrived rattling around in a cardboard box with no package material. The lock kit box was absolutely destroyed but fortunately the lock was undamaged. UPS delivery because the shipping label came off. I tried contacting etrailer by email twice because UPS kept telling me my package was damaged, never heard a thing back. Luckily my driver figured out it belonged to me and was able to get the box relabeled.
by:
I'm very pleased with the weigh-safe hitch. it exceeds all my expectations. extremely well built and it is extremely heavy duty which is what I was looking for. I will be using it for years.
by:
Best trailer hitch ever purchased. Worth every penny.
by:
Looks great, works even better, delivery was quicker than I would have believed. Great job Etrailer!
by:
Quick install, nice! It’s built like a tank, I was concerned about weight, not anymore, it’s so light, even the UPS guy was carrying the hitch with one arm tucked by his side! 3” shank, yes, not much slop. Looking forward to using it for the 1st time tomorrow. Looks sweet on the truck too!
by:
Quality product. Much lighter and easier to handle than comparable steel hitch. Scale seems to be accurate based on camper loading and advertised dry tongue weight.
by:
Haven't open the box yet. Shipping was fast.
by:
Great hitch, the 8" drop worked great on my 24 Ford F250 Tremor.
by:
I haven't used the product yet but the experience has been great dealing with etrailer and it looks/feels like a quality built product.
by:
Great product for being able too adjust the right height for those that have multiple trailers.
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See what our Experts say about this Weigh Safe Trailer Hitch Ball Mount

  • Recommended Ball Mount With 1 7/8" Ball for a 3" Hitch
    Brian, Weigh-Safe does make a 1 7/8" ball for their 2" hitches # WS96RR, but if you need a one for a 3" hitch then you'd need to use the B&W Tow & Stow 3-Ball Mount # BWTS30049B which has a 1 7/8" ball, a 2" ball, and a 2 5/16" ball.
    view full answer...
  • Weigh Safe Ball Mount with Tongue Weight Scale For 2020 F350 with 3" Hitch
    Hi Greg! Absolutely! Yes, we do offer Weigh Safe ball mounts for trucks with a 3" receiver, and I’ve got a great one for you! The Weigh Safe Ball Mount # WS36ZR is the perfect match it has all the same great features as part # WS88RR, but it's sized to fit your 3" receiver without needing any adapters. It’s got everything you’d want: the built-in tongue weight scale so you can make sure your trailer’s loaded safely, an adjustable drop and rise for a perfect fit with your setup, and...
    view full answer...

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Info for this part was:

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