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Baja_Man's avatar
Baja_Man
Explorer
Oct 17, 2016

ACME vs American/Stehl - turning explanations needed

Hello all--
In a previous post I asked for input on a few different dollies.

Now I need assistance in understanding the differences in how they turn.

The ACME is rigid and uses the towed vehicles steering to make right and left hand turns. Steering wheel is left UNLOCKED. Not sure of the physics behind this and if the turning causes stresses on the towed vehicles suspension, body, chassis, steering, etc. Since the turning is not the same as if the towed vehicles wheels/tires were on ground turning, it seems as though there are different physics going on that I do not fully understand.

The American/Stehls and other dollies use a swivel platform whereby the towed vehicles wheels are strapped down and steering wheel is LOCKED. When turning under tow, the platforms swivel and the vehicles steering never moves. Not sure what actually swivels and could not find any videos or pics showing how this works. Again, the physics of this type of dolly are also not clear to me.

Seems that most dollies use a swivel platform and the ACME may be the only one using a rigid frame with no swiveling, relying on towed vehicles steering to be what steers dolly.

According to American: the ACME puts undue stress on the towed vehicles front suspension, body, chassis, etc. Tires also wear very fast, are small in size (10") and difficult to find replacements. LED lights are expensive to replace (they tend to break as all others from kids, bicycles hitting them, storage accidents, etc.... where American lights are easily found at Walmart and much less expensive). And finally, the surge brakes experience quick failure from all of the debris tossed at them from being towed behind motor home (I am assuming exposed calipers vs enclosed drums)

So, what gives with all of this?

Swivel or no swivel AND why yes or no to each style?
  • I don't think a person has to be very smart to know that there for sure is more stress on the vehicles suspension, and also on the dolly's frame work, and that the tires are somewhat slipping on the pavement in the turns, but that don't mean it causes any serious problems,.....and apparently doesn't
    This has all been hashed over many times, and they work ! And the price really should be a lot cheaper,....they are much cheaper to build w/o the steering built in.
  • I have an Acme. It turns fine, there is no more stress on the steering or suspension than there is when you are driving and make a turn. In my mind it is the best in the business.
  • Well said Snowman9000.

    FWIW, if I was buying a dolly, it would be the Acme.
  • Regarding what you say are American's criticisms of the Acme, I would say that talk is cheap and most of those points are silly on the face of them.

    How is the stress on the car any worse than four down towing?
    I do hear the 10" tires wear quickly. But you can buy a lot of tires for the price difference of the swivel dollies versus the Acme. I'm told they are a standard boat trailer size, but in a less common heavy load range.
    Arguing against LED trailer lights is stupid. They are common as dirt today.
    Toad brakes get the same exposure behind the MH, and I have never heard of it being a problem. Brakes live in a nasty environment anyway.

    Just reading that nonsense makes me think American is desperate.

    I think the original idea was a swiveling dolly. Then someone realized it wasn't necessary because the car's front tires will swivel as needed. And it's a lot simpler, lighter, cheaper dolly that way.

    As to the physics of the movements of each, you might be overthinking it. On a swivel dolly, the dolly tires track as needed, and the car swivels so its rear tires can do the same. On the Acme, the same thing happens. In terms of that tracking, the only difference is what is turning, the swivel pan or the car's steering.

    A lot of newer cars don't have a steering lock. If you have one of those and you use a swivel dolly, you'll have to rig and un-rig your own steering lock each time you load and unload.

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