1. Trailer Hitch Ball Mount
  2. Weigh Safe
  3. Fits 2-1/2 Inch Hitch
  4. Adjustable Ball Mount
  5. Drop - 4 Inch
  6. Rise - 5 Inch
Weigh Safe 2-Ball Mount w/ Built-In Scale - 2-1/2" Hitch - 4" Drop, 5" Rise - 18.5K

Weigh Safe 2-Ball Mount w/ Built-In Scale - 2-1/2" Hitch - 4" Drop, 5" Rise - 18.5K

Item # WS4-25
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Trailer Hitch Ball Mount
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Shipping Weight: 18 lbs
Weigh Safe Two Balls Trailer Hitch Ball Mount - WS4-25
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Measure your tongue weight to determine if you can safely tow by simply coupling your trailer to this ball mount. Ball platform locks to shank. Tow up to 8,000 lbs with the 2" ball and up to 18,500 lbs with the 2-5/16" ball. Lowest Prices for the best trailer hitch ball mount from Weigh Safe. Weigh Safe 2-Ball Mount w/ Built-In Scale - 2-1/2" Hitch - 4" Drop, 5" Rise - 18.5K part number WS4-25 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (804)
  • Q & A (15)
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  • Why etrailer?

Weigh Safe Trailer Hitch Ball Mount - WS4-25

  • Fits 2-1/2 Inch Hitch
  • Adjustable Ball Mount
  • Drop - 4 Inch
  • Rise - 5 Inch
  • Weigh Safe
  • Two Balls
  • Class V
  • 18500 lbs GTW
  • Built-In TW Scale
  • Aluminum Shank
  • Stainless Steel Ball

Measure your tongue weight to determine if you can safely tow by simply coupling your trailer to this ball mount. Ball platform locks to shank. Tow up to 8,000 lbs with the 2" ball and up to 18,500 lbs with the 2-5/16" ball.


  • Ball mount with included hitch balls lets you hook up your trailer to your tow vehicle
    • Shank slides into hitch receiver
    • Ball provides connection point for trailer coupler
  • Tongue weight scale built into the ball mount platform helps you balance your trailer
    • Promotes safe towing - lets you know if your load needs to be adjusted before you tow
    • Simple operation - automatically provides a measurement every time you couple your trailer
    • Efficient and hassle-free - eliminates the need for separate or commercial scales
  • Adjustable height lets you tow trailers of different heights with the same vehicle
    • Slide ball mount platform up or down shank and secure in place with included dual locking pins
      • 2 Keys are included
  • 2 Different-size hitch balls let you tow trailers with different coupler sizes
    • To switch ball, simply remove the ball-retaining lock pin from the platform, insert ball, and reinsert pin
  • 6061 T6 billet aluminum shank and mounting platform provide superior strength and durability
    • Solid block construction provides greater strength than hollow steel competitors while also maintaining a light weight
    • Rustproof for a clean finish that stands the test of time
  • Stainless steel hitch balls are corrosion resistant
  • Hitch pin and clip or hitch lock sold separately
  • SAE J684 certified and VESC Regulations V-5 compliant
  • Made in the USA


  • Application: 2-1/2" x 2-1/2" trailer hitch receivers
  • Gross towing weight:
    • 2-5/16" Diameter hitch ball: 18,500 lbs
    • 2" Diameter hitch ball: 8,000 lbs
  • Tongue weight: 2,200 lbs
  • Distance from center of hitch pin hole to center of hitch ball: 8-3/4"
  • Maximum drop: 4"
  • Maximum rise: 5"
  • Incremental height adjustment: 1"
  • Scale gauge diameter: 1-1/2"
  • Warranty:
    • Limited lifetime for ball mount
    • 1-Year limited for scale gauge

Weigh Safe ball mount coupled to a trailer

This Weigh Safe ball mount has an easy-to-use, built-in scale that measures your trailer's tongue weight every time you tow. If the scale indicates that your tongue weight is too low or too high, you can adjust it before you head out so that you can complete your journey with the peace of mind that your setup is safe.

What is Tongue Weight?

Tongue weight (TW) refers to the weight that the fully loaded trailer exerts downward on the hitch ball of the tow vehicle. Tongue weight is typically 10 percent - and should not exceed 15 percent - of your gross trailer weight. For example, a 10,000-lb trailer should have a tongue weight between 1,000 lbs and 1,500 lbs. You can adjust the tongue weight of your trailer by removing or adding cargo, or redistributing the load on the trailer. The tongue weight should not exceed the capacity of your tow vehicle, your hitch, or any of your towing components.

Why is Tongue Weight So Important?

Weigh Safe helps ensure proper trailer tongue weight

Simply put, too little tongue weight can cause trailer sway and too much tongue weight can cause the tow vehicle to perform poorly. You may have difficulty steering, gaining traction, or braking when driving a setup that has too much weight pushing down on the rear of the vehicle. Ultimately, towing with an improper tongue weight can cause you to lose control of your vehicle or cause your trailer to separate from the vehicle.

Built-In Tongue Weight Scale

The gauge of the Weigh Safe built-in tongue weight scale

The Weigh Safe ball mount's built-in scale signals you to adjust your load before you hit the road, resulting in a much safer and enjoyable towing experience. Before this ball mount, gauging your trailer's tongue weight was a hassle. You had to rely on inefficient bathroom scales, make a trip to the weigh station, or purchase a separate tongue weight scale. But with the Weigh Safe's built-in scale, measuring your tongue weight is as easy as coupling your trailer to your ball mount. Simply hook-up your trailer to the Weigh Safe ball mount just as you would any other ball mount. The weight of your trailer will push down on the hitch ball, which in turn pushes down on an internal hydraulic piston that sits on a bed of oil. When the piston drops into the oil, the pressure reading is sent out to the scale.

Easily Adjusts to Fit Your Setup

Weigh Safe ball mount has adjustable height

Adjusting and setting up the Weigh Safe ball mount to work with your specific trailer is easy. First, unlock and pull out the dual pins and remove the platform from the shank. Next, pull out the hitch ball retaining pin from the back of the platform and insert either the 2" or 2-5/16" hitch ball. A 1-7/8" hitch ball (WSB-L - sold separately) is also available. Then reinsert the retaining pin to secure the ball to the platform. Replace the platform and slide it along the shank to the desired height. Insert the dual pins and use one of the included keys to lock the pins in place.

Weigh Safe ball mounts installed in drop and rise positions

The Weigh Safe ball mount can be used in either the drop or rise position to best suit your application.

Superior Aluminum and Stainless Steel Construction

From the first moment that you lay eyes on the Weigh Safe ball mount you'll see that you're getting a superior, well-made product. The Weigh Safe's shank and ball mount platform are made entirely of 6061 T6 billet aluminum, which is the same material that is used to build aircraft components, automobile frames, and freight liners. This type of aluminum is known for having superior strength while maintaining its light weight, which makes it highly desirable over hollow steel components. 6061 T6 aluminum is also rustproof, which means the Weigh Safe hitch will maintain its clean, shiny, and impressive appearance for years to come. And the hitch balls are made of solid stainless steel, offering far greater protection against rust and corrosion than other steel hitch balls that are only painted or plated on the surface.

The Weigh Safe ball mount meets VESC V-5 regulations and is SAE J684 certified. These regulatory bodies - the Vehicle Equipment Safety Commission and the Society for Automotive Engineers - create standards for the design, construction, and performance of automotive and towing accessories. Weigh Safe has had this ball mount thoroughly tested in simulation to ensure that it complies with these standards. The result is a strong, safe, sturdy product that is built to last.

WS4-2.5 Weigh-Safe Trailer Hitches with Tongue Weight Gauge - 2" x 2-5/16" Ball Combo - 4 Inch Drop - 2-1/2 Inch Hitches

Customer Reviews

Weigh Safe 2-Ball Mount w/ Built-In Scale - 2-1/2" Hitch - 4" Drop, 5" Rise - 18.5K - WS4-25

Average Customer Rating:  4.8 out of 5 stars   (803 Customer Reviews)

Measure your tongue weight to determine if you can safely tow by simply coupling your trailer to this ball mount. Ball platform locks to shank. Tow up to 8,000 lbs with the 2" ball and up to 18,500 lbs with the 2-5/16" ball.

- WS4-25

Great unit and built like a MAC 887378

- WS4-25
by: 08/04/2020

I use at least 4- 7 times a week as a boat repair shop owner to lake test boats. I love it, easy, clean, cool and work awesome! Highly recommend! 855794

- WS4-25

Great product, well constructed. 837237

- WS4-25

Love it - getting ready to use it today 794085

- WS4-25

Very nice quality and the finish is next to none. I have yet to test the weight scale but if it's like any other etrailer product it should be good. 714785

I will say that the fit and finish of this hitch is 2nd to none. However, the weight scale has never been accurate or ever worked properly. I weigh over 200 lbs. and the scale does not move when I stand on it and my 35 boat that has a tongue weight of about 1200 lbs. only reads 200 lbs. I probably should have sent back as defective but never got around to it and hope that mine is one of very few that may have had an issue. However, I am confident that if I had sent in when I realized the defect that Etrailer would have replaced it but I never got around to sending it back.
Mark - 10/09/2020


- WS4-25

Had for a year. We haul a horse trailer. Item exceeds my expectation in function and performance. Worth the money. Easy adjustment. Gauge works great. 711402

- WS4-25

Great product, Just showing the tongue weight is great then adjust your weight as you need. Heavy duty. Thank you 681307

Still going strong, love the weight scale
MICHAEL L - 08/07/2020


- WS4-25

This is a great item, well made and works great. 664751

- WS4-25

Works great, perfect for my tow behind toy hauler. I can adjust the load as needed to to get the perfect tongue weight. 642132

- WS4-25

Doesn't fit great on2.5" 630904

- WS4-25

Very nice engineered piece 630878

- WS4-25

A work of functional art. Works perfectly and looks the part on a $70k truck. 503475

- WS4-25

Looks great. Light weight. Tongue weight scale is a very nice feature. 493256

- WS4-25

works great.. use it to tow a 29 foot toy hauler 490509

- WS4-25

I would like to Thank You for the very prompt delivery of my order which I received October 12. I placed my order online on October 9th, 2017. I am very pleased to see such a quick delivery, excellent service. I came across your product by luck I might add, while searching for hitches. I am the owner of BasinBayou, LLC. We are a catering/Food Truck company in Texas. We are in the process of having a custom built Food Trailer fully equipped. I wanted a hitch that I knew would handle the load. Perhaps a bit of overkill some might say, however I believe in quality over any price for long term usage. The craftsmanship is absolutely a thing of beauty. We are due to pickup our new trailer by the end of this month from the manufacturer in Florida. I will keep you posted and send pictures of the hookup with our new trailer. Please feel free to use this as a review for a compliment of your excellent service. 459688

- WS4-25

Awesome hitch, weight scale is great and the exchange of the 2 inch and 2 1/2 hitch ball is a easy exchange , only little issue is the hitch an receiver is a little noise but with weight on it is quite, I use it to pull my 4000 boat and my 10000 lb desert trailer easy 438847

- WS4-25

I like the idea of being able to know how much tongue weight I have while loading. I can readjust the load as needed when loading. This product gives me that ability. A quality product that was shipped and received as stated from etrailer. 436815

- WS4-25

Easily one of the prettiest ball mounts I've ever had. This kit included a locking dual pin, which made the purchase of the separate locking dual pin an unnecessary expense, so I guess I now have a spare, but otherwise everything was as advertised. I was hoping that I could flip the ball mount and reverse it under the receiver, and I can, but only in the lowest set of holes. The low profile socket head fastener that goes into the piston assembly for the gauge contacts the reinforcing ring on the receiver hitch just before the 5/8" pin can be installed...I may relieve the reinforcing ring slightly (less than 1/32") to gain the 1" of ground clearance in this configuration when not towing. 410993

- WS4-25

Works great, easy to adjust. Love having the built in scale so you know your tongue weight! I ordered one with too large of drop, called customer service and they quickly sent me another one and included a shipping label for the return. Enjoy working with this company! 346054

- WS4-25

If there was an option for 4.5 I would use that. I really like the hitch. The hitch balls and aluminum hitch are very well made and almost a work of art. It functions very well as a hitch and I have no corrosion or signs of deterioration after a year of pretty hard use. My only two complaints are: 1. The scale doesn't work well for lighter trailers because there has to be about 300 pounds of tongue weight before the thing starts to register. So if you want to make sure you have 10% tonge weight on a utility or jetski trailer you are out of luck. 2. I have to clean out the area where the ball sits on the scale or it quits working. Not a big deal, but kind of messy. Except for those two things, I really love the hitch. 340544

- WS4-25

This is one beautiful product and confident it will last my lifetime and more. One issue came up after opening the package and the scale was not color coded as depicted on your site. Called eTrailer and spoke with Patrick. This gentleman took up my cause and got me answers as to why. Very professional and so concerned to satisfy the customer. The factory in Utah is sending out a replacement at no charge immediately. I am still giving the product and service a 5 star because of the way Patrick and Lindsay at the factory handled my issue. My hats off to both of these representatives of eTrailer and Weigh Safe Manufacturing. 326650

- WS4-25

Never has shown young weight ! Piece of junk ! 323571

We have found that the Weigh Safe ball mounts are reliable and provide accurate weight readings. They do have a limited lifetime warranty against manufacturer defects. I have forwarded this to customer service, who will be in contact with you to assist with your order.
-- Laura E - 12/20/2016


- WS4-25

I really like being able to see how much tongue weight I'm putting on the vehicle when I load it. What a great invention! 298114

- WS4-25

This is a great trailer hitch. We will feel confident trailering our boat as it is a heavy duty hitch. Thank you! 290721

- WS4-25

So far, so good. Adjusts very easily. Fit perfectly. I have only towed with it one time so far, but worked flawlessly. I hope it hold up as well as it looks. 264774

Show More Reviews

Ask the Experts about this Weigh Safe Trailer Hitch Ball Mount

  • Solution for Needing Replacement Keys for Weigh Safe Ball Mounts
    Weigh Safe does not offer spare keys at this time but I may have a solution. They offer lock replacements with the keys to that specific lock. If you find you ever need the lock core replaced, we have the Locking Dual Pin Assembly for 180 Hitch and Weigh Safe 2-Ball Mounts, # WS03, or the Locking Dual Pin Assembly and Hitch Pin Set for 180 Hitch and Weigh Safe 2-Ball Mounts - Keyed Alike, # WS06. These both come with the matching keys.
    view full answer...
  • Troubleshooting Weigh Safe -2 Ball Mount for 2-1/2 Inch Hitch with Increase Movement At Hitch Ball
    The Weigh Safe 2-Ball Mount w/ Built-In Scale - 2-1/2" Hitch - 4" Drop, 5" Rise - 18.5K # WS4-25 should not have a lot of play in the ball. Make sure the pin that holds the ball in place is working properly and the hitch ball is the correct size for the trailer and weight you are pulling. You should be using the 2-5/16 inch ball for that 10-12,000 lb trailer. A little bit of play is normal, but increasing amounts of play is a problem and may require replacement parts. You may...
    view full answer...
  • Can Ball Mount Platform of Weight Safe Adjustable Ball Mount Store Behind Shank
    Yes, the Weigh Safe Adjustable Ball Mounts like the # WS4-25 are capable of having the ball mount platform store behind the shank like in the picture I attached. This particular model wouldn't have a tall enough shank though.
    view full answer...
  • Recommended Weight Distribution System for 11,000 Pound Travel Trailer
    Verifying your trailer's loaded tongue weight is a great idea, but you will not be able to use the Weigh Safe 2-Ball Mount # WS4-25 with a weight distribution system. Weight distribution systems will require a specialized shank and will not attach directly to a ball mount like the Weigh Safe product. To check the loaded tongue weight of your trailer, I recommend using a scale like the Sherline # 5780. The most important factor when choosing a weight distribution system is the total...
    view full answer...
  • Ball Mount with 4 Inch Rise for a 2014 Ram 3500 with 2-1/2 Inch Receiver and 16,500 Pound Boat
    the best ball mount option for the 2-1/2 inch receiver on your 2014 Ram 3500 and the 16,500 pound boat plus the trailer is going to be # AMSCV-6. This is a cushioned ball mount rated for 18,000 pounds. It offers 4-3/4 inches of rise. I have included a link to a video review of this ball mount for you. This ball mount has a ball hole diameter of 1-1/4 inches. If you need a 2-5/16 inch ball I recommend # C40008 which is rated for 20,000 pounds.
    view full answer...
  • Measuring a Trailer for a Ball Mount with Correct Drop or Rise
    You want the trailer to be at the exact height it is when towing so it's best to measure with it loaded. You also want to make sure that you're measuring to the bottom of the trailer's coupler and that the trailer is parked on level ground and is as level as possible. Also, make sure your vehicle is parked on level ground and measure to the top of the inside of the receiver hitch. The difference of the two measurements is the rise or drop you need. If the vehicle is higher than the...
    view full answer...
  • Is There a Hitch Adapter to Use a 2-1/2" Weigh Safe Ball Mount on 2" Receiver
    I may have a solution for you, but unfortunately we do not carry any hitch adapters that will turn a 2" receiver into a 2-1/2" receiver. I do believe they exist, but the issue with using something like this is that they reduce the tongue weight capacity of the hitch by 50%, so they're really not ideal for any type of towing. The best solution would be to use something like the # WS4-2 which is designed for 2" hitches and is otherwise the same as the # WS4-25. This would be the best solution...
    view full answer...
  • Will the Weigh Safe Ball Mount for 2.5" Shanks Work With Rock Tamers
    In regards to the Weigh Safe 2-Ball Mount part # WS4-25, the distance from the center of the hitch pin hole to the back of the upright is about 3-1/2". It will work with the Rock Tamers Heavy-Duty, Adjustable Mud Flap System part # ERT00110 on some vehicles but others it won't which is why you need to measure. The distance from the center of the hitch pin hole to the end of the receiver tube can be different on every trailer hitch. The B&W Tow & Stow 3-Ball Mount part # BWTS20049B is...
    view full answer...
  • How to Determine What Rise or Drop Weigh Safe Adjustable Ball Mount Needed for Livestock Trailer
    The best thing to do is hitch the trailer up loaded using a ball mount you currently have that puts you pretty close to level or borrow one. When the trailer is hitched up, make note of how much squat occurs. Measuring the before and after height of the wheel wells at the back of the truck is the easiest place to do that. Then, use the formula in the provided help article to determine the amount of rise or drop you'll need. To that figure, you'd add in the amount of squat you get to...
    view full answer...
  • Availability of Shank for Weight Distribution that Can Fit 2-1/2 inch Hitch
    The Weigh Safe 2-Ball Mount w/ Built-In Scale # WS4-25 that you referenced cannot be used with a weight distribution system as the holes of the shank do not match the standard hole dimensions that WD shanks will use, and also the ball mount platform does not have any way to attach to spring bars. Even if it could though the spring bar tension would give an inaccurate reading on the scale. Sounds like you may be looking for an adjustable shank for a weight distribution system and a 2-1/2...
    view full answer...
  • Ball Mount Recommendation for 2-1/2 Inch Hitch on 2019 Ford F-250 Super Duty
    The ball mount I highly recommend for your 2019 Ford F-250 Super Duty that has a 2-1/2 inch trailer hitch receiver like the Curt # C15802 is the B&W Tow & Stow because of its high quality, stow-away design, and the fact it protects the ball mount platform from theft. The hitch ball platform of this mount actually flips underneath the shank to face your truck, saving you from accidentally slamming your leg into it when walking behind your F-250. Additionally, when the Tow & Stow is in your...
    view full answer...
  • How to Pick Out Weigh Safe Adjustable Ball Mount for 2-1/2 inch Hitch for Ground Clearance
    When we installed the Curt hitch # C15810 on a similar 2007 Ford F-250 to your 2006 Ford F-350 we found that from the top of the hitch opening down to the ground measured 20 inches. The Weigh Safe Ball Mount part # WS10-25 is a great ball mount but it would hang down 13 inches from the top of your hitch opening putting it about 7 inches off the ground. A better option for ground clearance would be the same ball mount but with less drop part # WS6-25 as this would sit 4 inch taller....
    view full answer...
  • Comparing Sherline Tongue Weight Scale 5780 to WeighSafe Ball Mount Scale WS4-25
    The Sherline Tongue Weight Scale # 5780 with its 2000-lb maximum capacity is the only tongue weight scale we offer. We don't carry the other model LM1000. However, we do also carry the Weigh Safe adjustable ball mounts that feature an integrated tongue weight scale. They're available in various different rises and drops, starting with the # WS4-25 which offers a 14.5K capacity and a maximum 4 inch drop to a 5 inch rise. The ball mount provides a 2 and a 2-5/16 inch trailer ball. Since...
    view full answer...
  • Availability of Trailer Tongue Weight Scale with 1000 lb Capacity
    The # 5780 with its 2000 lb capacity is the only tongue weight scale we offer, however we do carry the Weigh Safe adjustable ball mounts that feature an integrated tongue weight scale. They're available in various different rises and drops, starting with the # WS4-25 which offers a 14.5K capacity and a maximum 4 inch drop to a 5 inch rise. The ball mount provides a 2 and a 2-5/16 inch trailer ball. There are also available ball mounts that offer a larger rise/drop as you can see by clicking...
    view full answer...
  • Heavy-Duty Tow Package for a 2009 Chevrolet Express 1500
    There will be no wiring differences between the 2WD and AWD models of the 2009 Chevrolet Express 1500 in regards to trailer or brake control wiring. The Curt Class IV Trailer Hitch, # 14090, is an excellent choice for your van. We have an installation video of this hitch on a 2008 model that I attached for you if you plan to complete the installation yourself. The installation will be the same on your Express. For trailer wiring, you will need the following kits: Tow Ready T-One...
    view full answer...

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Info for this part was:

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Edited by:
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Installed by:
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Installed by:
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Video Edited:
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Written by:
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