To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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Heavy trailers and bed loads can make the rear of your truck sag and throw off handling. The Hellwig Load Pro 35 Heavy Duty Helper Springs with Custom Mounting Kit add up to 3,500 lbs of rear-axle support to keep your vehicle level when towing or hauling. They prevent sagging, reduce body roll, and help maintain steering and braking stability when the weight adds up. By sharing the load with your factory leaf springs, they also help extend the life of your suspension, tires, and brakes.
A harsh ride isn’t the trade-off for added support here. These helper springs flex with your existing leaf springs to limit bounce while still providing solid stability. The design keeps your ride controlled whether you’re hauling a camper, towing a trailer, or carrying tools in the bed every day. Each side can be adjusted independently to balance uneven loads so the truck stays stable and level no matter how the weight is distributed.
Work trucks see all kinds of conditions, so long-term durability matters. These helper springs are built from heavy-duty steel and finished in a silver vein hammer tone powder coat that resists corrosion. The constant-rate spring design delivers reliable performance under frequent or continuous load use without losing strength or shape over time.
Installing extra suspension support doesn’t have to be complicated. The included bolt-on custom mounting kit makes installation straightforward using common tools—no fabrication required. With everything designed to fit together cleanly above your factory leaf springs, you can get dependable load control without an all-day shop visit.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody, Andy here with etrailer.com. Let's take a look at these Hellwig Load Pro 35 heavy duty helper springs. Now these springs have been designed to fit your 2003 to 2016 Sprinter 25 2500s and 3500s. And on custom-fit parts such as these springs, I do recommend taking advantage of our vehicle fit guide here at etrailer.com. Just input the year, make, and model of your vehicle, and our fit guide will confirm if these springs will work for you or if we have something comparable that will work for you. These custom helper springs have a load leveling capacity of 3,500 pounds, and they're going to install above your Sprinter's rear factory leaf springs to reduce sway and body roll while preventing sagging when towing or hauling heavy loads.
They're going to extend the life of your factory suspension, tires, and brakes. And these springs will flex with your leaf springs to help limit bouncing while providing optimal stability. Now this is going to be a bolt-on insulation, again, above your factory leaf springs, with the included custom insulation kit. And as you can see, I've attempted to take some of the hardware, the U-bolts, and things like that, and kind of place it where they're going to be during the installation, just to kind of give you an idea of what the installation's going to look like, but you will receive this hardware to bolt this on. And the driver's side and the passenger sides can be adjusted independently for uneven loads.
Now, I do wanna mention that if your Sprinter is equipped with a brake fluid proportioning valve, these constant rate springs are not recommended. Only progressive rate helper springs should be used, and you can find those options from Hellwig here at etrailer.com. Another item to mention is if your vehicle is equipped with a factory overload, it may be, a factory contact overload, rather, it may be necessary to remove that before installing the new helper springs. You'll want to consult the installation guide. And then finally, you wanna make sure that you don't install these on vehicles with composite or plastic leaf springs.
These Hellwig springs are robust, so if you install these with spring factory leaf springs that are plastic or composite, these springs could fracture those, just so you know. These are made here in the U.S.A., have a durable steel construction, so that's going to ensure long-lasting performance. And they do feature a silver vein hammer tone powder coat finish. That's gonna resist corrosion. And again, I mentioned that the weight capacity on these springs is 3,500 pounds, but Hellwig springs do not actually increase your Sprinter's weight-carrying capacity.
So, you wanna make sure that you don't exceed the weight-carrying capacity of your Sprinter. And these do have a lifetime warranty from Hellwig. If I forget, if I forgot to mention it, instructions are included to guide you through the installation process. But 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.
Ratings & Reviews
Brooke M.
5/15/2025
Wow, 2 months in Alaska? That must have been beautiful. Would I be correct in assuming you got a front row view of the Northern Lights during your trip?
Brooke M.
4/8/2025
Hey Charles! Glad you able to improvise but I really feel bad it arrived missing pieces. Let me look into this more closely for you.
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Mike L.
7/14/2026
I wish we did too, Otis! The problem is that we have multiple warehouses. We don't stock everything at our Wentzville location where we used to offer will call which caused problems. We decided that although it's a great idea, we shouldn't do it if we can't do it right.