Caravan and Trailer Wheel Alignment
A caravan wheel alignment service sounds complicated. How can the wheels on caravans and trailers become misaligned?
It is common to find worn caravan tyres and wheel bearings in older caravans and trailers. Many kilometres, low tyre pressure, and shock loading are the prime causes of misalignment.
The rear axle suffers the most significant tyre wear in a tandem axle setup. If you take the time to put a long, straight edge across both tyres, I am sure you will be surprised!
Correcting the wheel alignment on a single-axle camper trailer is far easier than correcting the wheel alignment of a tandem-axle suspension system.
Check out our axle triangulation guidelines document here.
How vital are axle pads?
How vital are axle pads?Axle pads were initially designed to align the spring either above or below the axle.
In many cases, axle pads have not been welded into position because many manufacturers did not require welding. U-bolts were thought to provide enough force to clamp the axle and spring into their correct location effectively.
Previously, we recommended that only round axles required welded axle pads. Read on to find the solution to how and why u-bolts cause misalignment and spring breakages.
U-Bolts
Generally, u-bolts installed on a caravan or trailer camper are made from mild steel. Mild steel stretches within the first 300 kilometres of installation and requires re-tightening.
Loose axle pads and loose u-bolts
Imagine driving down the highway west of the Great Divide – no doubt you will encounter a pothole or two.
A tow vehicle, caravan, or trailer entering a pothole at 100 kph causes shock loading.
Shock loading transfers massive forces that try to push your axle or axle group towards the rear of the caravan or trailer.
Unwelded axle pads may cause damage if continued driving occurs.
What happens next?
Two things can happen to affect caravan or trailer wheel alignment:
- One wheel is now out of alignment. This alignment issue will produce significant wear on your tyres. If you have an overlay or drop axle, it may even have twisted the drop or overlay. Contact your dealer if your tyre wear is excessive.
- Loose-fitting u-bolts and axle pads will progressively cause the axle and spring assembly to fail. The beam will develop vibration, and the spring will eventually break about 75mm from the back eye.
Read an article on loose U-bolts and their effects here.
Axles without axle pads.
Axles without axle pads.Couplemate™ dispatches dozens of axles daily. A small percentage of them have axle pads welded into position as requested by the customer.
The cost of an axle ranges from $600 to $ 1,100.
If you are replacing an axle, please provide your chassis width so we can accurately weld your axle pads into position. The cost is $25.
Axle pads welded into position make your axle installation much more straightforward because the axle centres itself directly over the leaf springs.
This article assumes the chassis or frame is straight and true.
Independent Suspension
The manufacturer sets the independent suspension up for full load at zero camber.
Place a spirit level in a vertical position over the tyre. A gap of more than 5 mm is a concern.
Most independent suspensions have a camber adjuster installed. Rigid suspensions, such as the Couplemate ICS, do not require camber adjusters.
Loose Wheel Studs
A variety of factors cause loose wheel studs.
What causes loose wheel studs?
Tandem Trailers
The best way to check your tandem trailer is to place a piece of straight-edge steel across the front of both wheels.
Contact your service agent for an alignment if the tandem wheels are not aligned properly.
Finally, your u-bolts have likely come loose, and your rig has sustained some shock loading during your travels.
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- Overview of ADR 62/02 (Mechanical Connections Between Vehicles)
© Steve Wotherspoon 24th November 2018
Thanks Steve….. I think I will replace all the bushes, install new shockies (I see one is leaking) then check again. If still out I will get it done as I am not confident to weld axle onto plate.
Will head down to Wynnum to get shock absorbers etc and see how it goes.
Thanks again.
Roger.
Morning Steve.
I am scrubbing tyres on my tandem axle caravan and, following your advice in an earlier blog, checked alignment with a straight edge. I found the rear right hand wheel to be 20mm further back from the coupling point compared to the left hand side.
My problem is, how can I move it because the centre pin prevents movement. The centre pin is located into a plate welded onto the axle.
Should I just buy new springs as the van is 15 years old. It’s a light van (1680kg) and definately not over loaded.
Just discovered Couplemate and am really find your website helpfull,,,,Thank you. Regards Roger.
This is a prefect blog for who wants to know about lotus off grid caravan. Thanks for sharing this information.
Hello Adam and thank you for your comment. Steve Wotherspoon
this may sound silly but what is the difference between axle pads and shackle pads
Blair Stokes
Loose axle pads and loose u bolts
Driving down the highway, west of the great divide and no doubt you have found a pothole or two.
A caravan or trailer entering a pothole at 100 kph causes shock loading.
Shock loading transfers huge forces that try to push your axle or axle group towards the rear of the caravan.
If your axle pads are welded into position, you might not have noticed the damage and continue driving.
I think you meant If your axle pads are NOT welded into position
Thank you Alan, you are quite right. Fixed. Steve Wotherspoon