Why Do Tandem Axle Trailers Need Equalizers Instead Of Independently Mounted Axles?

Updated 06/23/2026 | Published 06/12/2024

Question:

Why are tandem axles on trailers connected with the center link, why not just mount two axles independently?

asked by: Randall

Expert Reply:

Hello Randall, that is a good question. To sum it up, the equalizer allows both axles of a tandem or triple axle setup to bear the full weight of the trailer equally, hence the name.

Lets say you had a tandem axle trailer with two independently mounted axles. Now say you go over a bump or elevation change. Without an equalizer, one single axle would be taking on most of, or the entire weight of the trailer for a brief second. This would immediately overload the axle and likely cause irreparable damage due to the excessive stress put on it. With the axles mounted separately you would not get far as things would fail fairly quickly. Mounting two axles independently does not combine the weight capacity like it does with an equalizer. The equalizer allows the full weight of the trailer to be equally distributed between both axles at all times. The design is quite simple really, but still a very effective suspension design that has not changed hardly at all over the years.

expert reply by: Jesse M

Jesse M.

2/17/2026

Hey Randall, did that explanation about how the equalizer balances the load between the axles clear things up for you? Your feedback could really help others trying to understand tandem axle setups.

Randall

2/17/2026

@JesseM Makes perfect sense. It's explained so clearly it's makes me wonder why I didn't think of / see that before. Thank you

Jesse M.

2/18/2026

@Randall Great! Glad I could help! Feel free to come back anytime you need anything!

Alan

6/23/2026

@JesseM my fifth wheel toy hauler sits a bit nose-high. I know it’s not ideal, and I actually just blew a newer rear tire on the trailer today driving through the heat in eastern Washington. I upgraded all 4 tires on both axles from 12 ply to 14 ply today. For the truck and trailer, I have equalizers between the axles. My springs are on top of the axles already. My B&W hitch pivot arms are at their lowest. I just bought a pin box that appeared to close the gap between the truck bed rails and the camper. All this, the nose sits about 10” higher than the back of the camper. Question is, do you think that I was just overloading 12 ply tires with a 16,000-17,000 trailer, and that I can count on the equalizers and 14 ply tires to keep me out of that situation again. Or do you recommend I do something different, like lift the trailer off the axles (not fond of the idea personally), or something else?

Jesse M.

6/23/2026

@Alan Hey Alan, honestly the thing that jumps out at me is not the 12-ply versus 14-ply tires, it's the fact that the trailer is sitting about 10" nose high. That's way more nose high than I'd consider normal, and I'd want to address that regardless of the tire situation. When a fifth wheel sits that high in the front, it puts more weight on the rear trailer axle, so it's entirely possible those rear tires were carrying a lot more load than you realized, especially with a 16,000-17,000 lb toy hauler and summer heat working against you. The 14-ply tires definitely give you more margin, but I wouldn't count on them or the equalizers to solve a weight distribution problem. Equalizers help, but they don't magically make both axles carry the same load. If it were mine, I'd get axle weights and figure out a way to get the trailer closer to level before assuming the tire upgrade fixed the issue. A trailer running 10" nose high is something I'd consider needing correction, not just something to live with. We do have one lift kit that will work with your setup, the Correct Track Trailer Alignment and Lift Kit # RR55QX. This will provide 2-1/4" of lift for a tandem axle trailer.

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