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Ultra-Fab Leveling Blocks for Trailers and RVs - 8-1/4" Wide x 8-1/4" Long - Qty 10

Ultra-Fab Leveling Blocks for Trailers and RVs - 8-1/4" Wide x 8-1/4" Long - Qty 10

Item # UF48-979051
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Interlocking blocks stack to different heights and can be positioned beneath jacks, stabilizers or RV wheels to add just enough lift to level your rig. Lowest Prices for the best rv leveling blocks from Ultra-Fab Products. Ultra-Fab Leveling Blocks for Trailers and RVs - 8-1/4" Wide x 8-1/4" Long - Qty 10 part number UF48-979051 can be ordered online at or call 1-636-306-4830 for expert service.
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Ultra-Fab Products RV Leveling Blocks - UF48-979051

  • Stackable Blocks
  • 8-1/4L x 8-1/4W Inch
  • 10 Blocks
  • Blue
  • Ultra-Fab Products

Interlocking blocks stack to different heights and can be positioned beneath jacks, stabilizers or RV wheels to add just enough lift to level your rig.


  • Stackable blocks provide extra lift to level your trailer or motor home
    • Position beneath jacks, stabilizers or trailer wheels
  • Interlocking design guarantees no shifting or collapsing once stacked
    • Stack straight up for extra height
    • Stagger blocks to create a ramp so you can easily drive up
  • Durable plastic construction
  • Storage case with integrated carrying handle included


  • Quantity: 10 blocks
  • Individual block dimensions: 8-1/4" wide x 8-1/4" long x 7/8" tall
  • Weight capacity: 30,000 lbs
  • 3-Year warranty

Note: The manufacturer does not recommend stacking more than 5 blocks high

48-979051 UltraFab Ultra Leveling Blocks - 10 Pack

Video of Ultra-Fab Leveling Blocks for Trailers and RVs - 8-1/4" Wide x 8-1/4" Long - Qty 10

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

Video Transcript for Ultra-Fab Trailers and RV Leveling Blocks Review

What's up everybody. It's AJ with Today, we're going to check out the Ultra-Fab, ultra levelers. These are leveling blocks to get your rig nice and level on uneven ground. So when you get to the campsite you see it's not exactly level, you don't want to be in your camper or RV that's like sideways walking around it all day. These are going to go underneath your jacks and under your tire to level it out.

Let's check them out.We've all seen this set up at the campsite, people using woodblocks to help level out their RV or camper, it's not an option. You really shouldn't do that, the wood's going to collect moisture or rot over time and fail on you. That's why we're using these leveling blocks today, they have a heavy duty plastic.I just want to show you, I'm trying to bend it. That's how thick.. It is.

If it was a flimsy plastic, you'd see me bend it or bow it a little bit. It's not happening. I kind of drop it on the ground a couple of times. I know you can't feel the weight but you might be able to hear that it's not just a high pitch, plastic noise and bouncing around like that. Super heavy duty, it's holding up to that.

So that's going to hold up to underneath your RV or camper.These leveling blocks are eight and a quarter by eight and a quarter. And also they're seven, eight tall up to the bottom of this top peg here, and then a half inch from there. And the reason why I separated that measurement, because when you go to stack them like this and like this, they nest inside of each other, you kind of just see the pack here at the top.They work in a variety of different ways and that's because of design much like blocks. You can see that these holes plug right into here and you've got your shape. So when you're pulling up on there, when you're tired, it's not going to kick one out from underneath each other, they're blocked together.

I can't pull them apart here, so you don't have to worry about them sliding and you can see, we use it over here on our camper today. They're nice and in place, I'll pull on it. It's not going anywhere and it gets you that height you need, but they also versatile so that you can switch it up. You never know the campgrounds aren't always going to be the same, so it's good to be able to have those options when you're on the road or you stack them five high.Now these levelers come in four different packs. You can get a four pack, an eight pack or a 10 pack. Each one comes with a carrying case where you just stack them back up in here and zip it up and then you can just easily throw in a compartment and it's out of the way, but it's with you at all times when you need it. Whichever one you go with though, they are all raised the same 30,000 pounds. Just if you have the eight pack or the 10 pack, don't stack them any higher than five.We've arrived at our campsite and you can already see that the ground is uneven. If you look at the level, you can see just how uneven our ground is. What we're going to want to do with our camper today is level it out and that's what when we just go from side to side, to try and figure that out.So we're going to take one block like this, put it underneath the level. You can see how that evens it out. We're going to do that on a bigger scale with our camper today, by putting our leveling blocks like this and kind of the pyramid stack, and we're going to put it behind our tire, then we're going to back up onto them. And that should get it closer to level and this might take a couple tries to figure out how much you need or how many of the blocks you need stacked up but we're going to start here and see how it works.Looking at our trailer, we actually added a magnetic level, we carry, to see how uneven it actually is. Alright, so now we're going to go ahead and I'm going to have Joe back up the camper onto the blocks and we'll watch it in action.Stop! You can see we're right on top of those blocks now, they didn't screech on the ground or move at all, they went right up on there and it's holding it pretty good. With our camper pulled up on the blocks, you can see it really did level it all out from side to side and front to back. So now what I'm going to do is lower the jack and detach our camper from our truck. We will have lowered the jack and also make sure you've already wheel chocked the wheels. I did that right before I started doing this.With my truck pulled forward now, I'm going to go ahead and lower the camera back down by the jack and try and get this level more here in the middle.Looks good there. We're going to take two of our blocks, put them underneath the stabilizer jack, that'll just help even things out. With our stabilizer jack making contact with the block, we're just going to go ahead around our camper and do the same thing for each stabilizer jack.Now we're back in their RV to check the level one more time, I'm going to do side to side and then front to back. So we'll just set this down, looks alright, there on side to side, let's try front to back. Awesome! We are completely level, it just goes to show you how easy it is to set up the Ultra-Fab bricks that go together, come apart very easily. It only adds a couple extra steps to your process when you get to a campsite anyway, but now the leveling it out is going to be such a big deal. You're armed with these. You're good to go. I think that does it for our look at the Ultra-Fabs. Hope this helped.

Customer Reviews

Ultra-Fab Leveling Blocks for Trailers and RVs - 8-1/4" Wide x 8-1/4" Long - Qty 10 - UF48-979051

Average Customer Rating:  4.8 out of 5 stars   (177 Customer Reviews)

Interlocking blocks stack to different heights and can be positioned beneath jacks, stabilizers or RV wheels to add just enough lift to level your rig.


The product works perfectly and the service was very prompt.

The leveling blocks work perfectly and are so simple to use.
Karl - 07/24/2022


Will help me level my travel trailer.


Solid product, good price, quick ship, excellent t customer service. What’s not to like?


I can’t say enough good things about etrailer!…. Simply excellent


These blocks have saved us so many times, I can not tell you. From when we are told that the RV parking is "All Concrete Pad" just to arrive and find out that only 1/2 the pad is concrete (so the blocks make it so our rig is level). To parking in the rain and starting out level, to waking to our heads being smooshed against the headboard as our rig settled into the mud-Blocks to the rescue!

Great purchase. Buy two sets, you will NEED them!


Appears to be sufficient


Great quality and compact


A must to carry for leveling, under your jack stand, under the leveling jacks. Rugged item!!! Helps to protect damage to asphalt as they prevent sinking in.


The blocks fit together neatly and securely, should function exactly as intended. They're surprisingly heavy, which bodes well for their strength for the job, though the tire loading on my small teardrop isn't much. They should last for years! Next outing starts tomorrow, we'll soon see.
etrailer was, as usual, fast and friendly.


Good price for good blocks


I finally got tired of using blocks of wood to level up my R.V., cheap yes but they take up a lot of room. So I ordered two sets of these blocks from e-trailer and glad I did. I've gotten great service from them before and they didn't let me down this time either. When I ordered them I wars told they would ship December 21st. Then I received another e-mail saying they were back ordered and would ship January the 4th. Still no problem, wasn't needing them right away. The next day I received a message that they had been shipped the day I was told they were back ordered. I recieve them on the 24th and now I can't wait to use them. Thanks e-trailer, I'm going to go clean out the wood pieces and store these right away.


They are great for leveling my 19' retro travel trailer


Original request for review was upon delivery. I waited. I used the product . . . in all manner of conditions. Now that I've used and abused, it's ok to say: I am pleased. These are the real deal, delivered earlier than promised back when I got them, and doing a better (flawless) job than even I (an admitted grouch about quality) expected. They are solid, versatile, and one of those items you say to yourself "I did right getting those". Good, quality product.

Tim, Ive been reading about the colored levelers, and I read that Orange are no good, yellow is the best, but are you showing Blue and saying they are far superior, and will not break... we have 28 dual axel. 7000lbs.ksocks
-- comment by: Nancy K - 05/29/2014


Had three break (explode) while leveling our 5th wheel on a lot containing compacted sand in Florida. Never had this issue with orange Lynx Leveling Blocks.


Look like they will do multiple jobs and take up less space and weight in storage


The leveling blocks arrived just in time for our first camping trip, the blocks work really well. The trailer is about 8,000 pounds loaded the blocks had no problem with the weight.
Also can't beat the price, quick shipping and the follow up from George at Etrailer was exceptional!


These levelers are simple to use, very durable, and store quickly. What a difference using them with our 25' class C motorhome. Highly recommend. My order also arrived quickly & shipping method upgraded at no extra charge. Thanks!

After a year this product still gets the job done. We are highly satisfied.
Patti B - 10/29/2017


The ultra fab leveling blocks worked very well. They stack easily and store in the bag even easier.

Very well and having no problems.
Alan C - 09/24/2015


We not only use them for tire leveling but trailer stabilizer bottom supports.

Instead of hauling heavy 6"x6" wood blocks, solid construction plastic blocks is cheaper. It's all about weight when towing a camper!


LOVE LOVE LOVE these. They are so nice and compact. Having the case to keep them all in one spot is a huge plus. My husband said he likes we don't have to carry a bunch of wood around in the pickup truck. The camper backs up nicely onto them. We also use them under our stabilizing jacks.


Work very well for RV leveling adjustments allowing me to replace heavy bulky wood with these nifty light blocks.


Trailer leveling blocks worked fine, just as advertised. May get another set


These leveling blocks work well in function, but are not as durable as I expected. They need protection on any gravel surface to avoid damage. I've needed to add plywood pads under them.


I'm Very happy with my product I purchased,and I Highly recommend the Fab leveling Blocks and Scissor Jacks . Thank you for your service a speedy delivery. Best Regards


I have as of yet used my camper. I did put the mirrors on my truck and they look really nice as well as gives me a great view of the traffic. the leveling blocks look like they will work very well. No more planks for leveling and that great with me.

Show More Reviews

See what our Experts say about this Ultra-Fab Products RV Leveling Blocks

  • Using Leveling Blocks Part # UF48-979051 on Each Wheel of Dually Pick Up
    I spoke with one of our contacts at Ultra-Fab, who recommend using blocks under each wheel. He went on to say that if only one block per side is used, it should be placed under the inner wheel. We have a product demonstration video showing the leveling blocks in use, to view the video click on the provided links.
    view full answer...
  • Height of Ultra-Fab Leveling Blocks Part # UF48-979051
    Each leveling block is 1-3/8 inches tall, but 1/2 inch of that will nest into the block placed on top of it. Two blocks stacked atop one another would be 2-1/4 inches tall.
    view full answer...
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  • How Flexible are the Ultra-Fab Leveling Blocks and What is the Weight Capacity
    The Ultra-Fab leveling blocks, # UF48-979051, have a 30,000 pound capacity. These blocks are rigid and could potentially flex some if torqued enough. A co-worker has blocks similar to these and he has not experienced any cracking, even in cold weather, but he says what will happen over time is the tops will start to get smooshed. Otherwise they will be a durable item.
    view full answer...
  • Can Ultra-Fab Trailer Levelers be Used to Provide a Base for a Scissor Jack
    Yes you can use the Ultra-Fab levelers, # UF48-979051, as bases for the foot on a scissor jack. These levelers have many uses, even if not directly stated. I have included a link to a video review for you.
    view full answer...
  • Should Both Tires be Raised When Using Leveling Blocks?
    When using leveling blocks such as the Ultra-Fab # UF48-979051 you do not have to raise both tires on 1 side. If you are using the blocks on 1 tire on 1 side of your travel trailer and you are level then you can continue to do that without any type of problem.
    view full answer...
  • How to Get Trailer Level When Parked on Decline
    Instead of using an uneven, unreliable piece of wood, I recommend checking out the Ultra-Fab Leveling Blocks # UF48-979051. These blocks are 8-1/4" wide x 8-1/4" long x 7/8" tall and you can position them under your jack and/or wheels to get your trailer level; there is also the option of using independent electric jacks, though that is an expensive upgrade and these blocks should work to get you level. I've added links to video reviews of these blocks for you to check out as well.
    view full answer...
  • Availability of a Top Cap for the Ultra-Fab Leveling Blocks
    The Ultra-Fab leveling blocks # UF48-979051 are designed for leveling trailers and RV's and the reason they are quite rigid on top and extremely durable. I called our representative at Ultra-Fab and there isn't any type of top cap available. You can use an additional set to increase their height as needed since they are stackable.
    view full answer...
  • What Does the Out of Stroke Error On the Lippert Ground Control System Mean
    The out of stroke error you are seeing is shown when you have extended the jacks further then they are designed to reach. The solution to this problem would be to try and find a more level place to park the trailer but you can also use the Ultra-Fab Leveling Blocks part # UF48-979051 so that the jack legs do not have to extend as far. The out of stroke error could also be caused by a few other things but if all works as it should save for this then odds are you are just reaching the maximum...
    view full answer...
  • Do You Have Any Mounting Brackets to Raise My Rhino-Rack Batwing Awning's Height?
    I have a solution for you. Unfortunately, there are no particular brackets that will raise your Rhino-Rack Batwing Awning in addition to the brackets you already own. A creative solution for raising your trailer a few inches are leveling blocks like the Ultra-Fab Leveling Blocks for Trailers and RVs # UF48-979051. With the leveling blocks, you will be able to stack the blocks under your trailer's tires in order to raise the overall height of the trailer. This will give your awning a height...
    view full answer...
  • Stackable Leveling Blocks For 2017 Keystone Passport
    Yes, you can use leveling blocks to support your stabilizer jacks, I recommend the Ultra-Fab Leveling Blocks for Trailers and RVs - 8-1/4" Wide x 8-1/4" Long - Qty 10 # UF48-979051. Not knowing the weight rating of the A frame jack I can not say yes or no. You will have to find out the weight capacity and tolerance of the specific jack.
    view full answer...
  • Trouble Shooting And Calibration Of Zero Point On Hydraulic Level Up Leveling System
    The Gear needs to go to the ground so it can in turn lower the front end. If the gear is not touching it will time out or if it runs out of stroke it will time out, to save the motor from burning out. If you press any button during the auto level process the system will stop the auto level process. When you are trying to auto level the system it will try to go through these steps. Front landing gear will retract, lowering the front of the unit below level, stopping, then lifting the front...
    view full answer...
    Image 1 for
  • Are Trailer Scissor Jacks Made for Leveling or Stabilizing a Trailer or Both
    Scissor jacks on trailers can be used as levelers or stabilizers. They are just not meant to lift up the weight of the trailer so that would limit the amount of leveling they can do. I recommend also using leveling blocks # UF48-979051, or the ones you already have, so that they are doing most of the leveling and the scissor jacks can be used to keep the trailer stable. Scissor jacks aren't meant to support a load off of the ground indefinitely so a secondary leveling device is recommended...
    view full answer...
  • Dimensions of Ultra-Fab Leveling Blocks
    The Ultra-Fab Leveling Blocks individually measure 8-1/4" wide x 8-1/4" long each; they are available in different quantities: - Quantity of 4: Ultra-Fab Leveling Blocks # UF48-979050 - Quantity of 8: Ultra-Fab Leveling Blocks # UF48-979052 - Quantity of 10: Ultra-Fab Leveling Blocks # UF48-979051 I have added a link to a video review of these leveling blocks for you to take a look at.
    view full answer...
  • Can Scissor Jacks be Used to Level a 5th Wheel Trailer and Will it be Hard to Manually Crank Them
    Ultra-Fab Ultra Scissor Jacks # UF48-979002 are designed to stabilize and support a trailer. To do so they will push up on the trailer but they cannot lift the trailer up off the ground so keep that in mind. This is true for all scissor jacks. Considering that the jacks will be placed where the trailer is the heaviest it would be difficult to manually crank the jacks. But if you used drill attachment # UF48-979005 and an electric drill it would make it a lot easier and faster. Another...
    view full answer...
  • Recommendation for 5th Wheel Trailer Slide-Out Stabilizers
    Using Ultra-Fab Slide-Out Supports, # UF19-960002, would be a good choice because they are adjustable from 21 to 37 inches which covers the range you have provided (26-1/2 on one and 30-1/2 on the other). If you wanted to put a leveler block underneath I recommend the Ultra-Fab levelers, # UF48-979051, because they are much more reliable than say a block of wood would be. I have included a link to a video review for you.
    view full answer...
  • How Do You Know How Many Ultra-Fab RV and Motorhome Leveling Blocks to Use
    You're correct, you'd need to use trial and error. However, you could use a leveler like part # HM09615, which would eliminate a lot of guesswork and eyeballing.
    view full answer...
  • Can Stabilizer Jacks be Used to Lift RV a Little
    To answer the last question first, a stabilizer jack such as # JSC-30 would be used until there was just enough tension to keep the trailer or RV from rocking. For actual lifting you would need a different device. So assuming that the RV was level these stabilizers would help prevent it from rocking back and forth or side to side (depending on where they were mounted) while you move around inside. If you were to try to lift weight with them you would have a very hard time because it just...
    view full answer...
    Image 1 for
  • Out of Stroke Error Code on Lippert Ground Control 3.0 Electric 5th Wheel RV Leveling System
    If you get the Out of Stroke error message on the Lippert Ground Control system, such as # LC358590, then that indicates that the jack has extended as far as it will go and cannot go any further. You might be able to solve this issue by raising the jack back up and placing some sort of leveler under it, such as # UF48-979051, so that the jack does not have as far to go. The other possible option is to move the coach or trailer to a different, more level location. To clear the error you...
    view full answer...
  • Leveler Recommendation for a Tandem Axle Cougar 5th Wheel Trailer
    The Andersen Rapid Jack, # AM3620, when used on tandem axle trailers is only meant to be used as a jack, not a leveler. For tandem axle trailers, I recommend Ultra-Fab levelers # UF48-979051. This kit comes with 10 levelers so you can raise the trailer in 1 inch increments. I have linked a video review of this kit for you.
    view full answer...
  • Should Leveling Blocks Be Used with the Lippert Ground Control If Wheel Is In Air When Parked
    The individual jacks of the # LC358590 are not designed to support the full weight of your camper when installed. If you are on unlevel enough ground that a wheel is in the air I would recommend a leveling block like the # UF48-979051.
    view full answer...
  • Can 2 or More Andersen Camper Levelers be Used on the Same Side of a Triple Axle Trailer
    Because of the travel of the suspension on a trailer, using just one leveler, # AM3604, would not provide enough lift in most circumstances. It would be difficult to use more than one per side on a triple axle trailer so I recommend going with a different type of leveler. Take a look at the Ultra-Fab Levelers, # UF48-979051. These 10 levelers can be stacked as needed and the space between tires of multiple axle trailers should not be an issue. With a triple axle trailer though a 10-pack...
    view full answer...
  • How Many Anderson Chocks and Levelers # AM3604 are Needed to Level a Tandem Axle Trailer
    Presumably you would be using chock and leveler # AM3604 to level a trailer side to side so at most you would need 2 of them. If you used 4 on a tandem axle trailer then it would still be off level just higher up from the ground. A better option that will allow you more precise leveling is to use leveling blocks such as # UF48-979051. That way you could use as many blocks as needed under each individual tire to level the trailer. We have a lot of leveling block options which I have linked...
    view full answer...
  • Troubleshooting Out of Stroke Error Code on Lippert Ground Control 3.0 of RV
    If you get the Out of Stroke error message on the Lippert Ground Control system, such as # LC358590, then that indicates that the jack has extended as far as it will go and cannot go any further. You might be able to solve this issue by raising the jack back up and placing some sort of leveler under it, such as # UF48-979051, so that the jack does not have as far to go. The other possible option is to move the coach or trailer to a different, more level location. To clear the error you...
    view full answer...
  • Out of Stroke Error Troubleshooting on Lippert Ground Control
    If you get the Out of Stroke error message on the Lippert Ground Control system, such as # LC358590, then that indicates that the jack has extended as far as it will go and cannot go any further. You might be able to solve this issue by raising the jack back up and placing some sort of leveler under it, such as # UF48-979051, so that the jack does not have as far to go. The other possible option is to move the coach or trailer to a different, more level location. To clear the error you...
    view full answer...

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