Most Popular Leaf Spring Enhancement System for Toyota FJ Cruiser

Product is as described, installation was easy & performed as expected.

I ordered these to help reduce the rolling (tilting) of my 18' travel trailer that I use off-road. Also, I am hoping it will absorb some of the shock. I have added some photos of before and after installation. The installation was simple, I used 5/16" sheet metal screws instead of the bolts supplied. Time will tell if they work as expected. As you can see from the photos, I have previously added an Etrailers shock mount kit to my axle. I made custom lower mounts that I welded to the axle and used the supplied upper mounts.

I installed the TSS-107-40 on a 32ft. 7500lb. travel trailer about a year ago. I also installed front axle Sumo springs SSF-302-47 and rear axle Sumo Springs SSR-312-54 on my 2022 Ram 2500. This is a review for all 3. I Have been on 7 camping trips since the Sumo springs were installed on my trailer. There's a noticeable difference on good roads. Smooths out the ride and less body roll when trucks pass me so it helps with sway. But I just took a trip down I95 through SC and the road was terrible. I mean SCDOT should be ashamed. Especially any bridges - even small ones over creeks - the dips and ramps before and after the bridges were terrible. You felt like you were being launched off of a ramp. This is where these things really did their job. They kept the contents of the trailer from being tossed and kept the trailer tracking well and immediately dampened bounce and porpoising. I also installed front axle Sumo springs SSF-302-47 and rear axle Sumo Springs SSR-312-54 on my 2022 Ram 2500 and again - noticeable difference immediately in the smoothness of the ride while towing. I bought the heavier weight springs and was worried about the stiffness of the ride with no trailer - and there is stiffness - but man am I glad I had them on the Interstate going through SC. Before I got them I could feel my suspension bottom out front and rear in certain situations. Now - not a problem. You'll have to be ok with a stiffer ride when not pulling a trailer - but you'll be happy you have them during stressful highway driving. I keep a lot of weight on my truck even without a trailer - bed cap, bed slide, tools and other items so that helps with the stiffness when not towing. I also installed the spacer on the truck rear Sumo Springs so they are engaged all the time. Not installing the spacers may help with the stiffness. I may take my spacers out. Easy installation for the most part. I did it with 2 jacks and a jack stand. The trailer Sumo Springs were even easier than the truck springs. Just be aware that these springs - IMO - are not to improve the comfort of your truck ride in general but more to improve the performance of your truck while under significant load. Having said that, they did help a lot with body roll while cornering with no trailer which was kind of a nice bonus. The rear springs also helped with squatting under the hitch weight of the trailer. You may also notice on the trailer spring picture that the gas line had to be re-routed a bit - there's a kit that comes with the springs that makes that very easy - you're able to use the existing holes.

Fast and easy install. Have kept my travel trailer’s cheap China leaf springs from re-shaping themselves into an ‘n,’ from the factory ‘u’ shape. Highly Satisfied!

These SumSpring helper springs are awesome! I needed to figure out a way to add some carrying capacity to my car hauler without having to change the leaf springs and these SumoSprings were the perfect solution.

These Sumo springs arrived on time and the quality looks great. Have not yet had a chance to install them, but based on what i have seen they should solve many of my concerns. Recently broke a leaf spring and was looking for a little added insurance for the new replacement springs. Also it's a single axle trailer with a lot of side to side bouncing.