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Old 01-14-2015, 09:08 PM   #15
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I can see their concern for some of the surge brake systems that have the tow bar on the dolly suspended from the surge brake like a platform rocker however most I have seen of late are straight linear units and not underslung so the stresses would be less with the brake coupling absorbing some of the initial shock or hammering the hitch would be receiving from a standard hard coupling.

Look over the link below and you can see most of the modern surge brake units keep things lined up the same as a standard coupler and would not be putting additional stresses on the hitch. Could just be legal verbiage (baggage) carried over due to some older systems from years gone by.

Hydraulic Surge Trailer Brake Actuators at Trailer Parts Superstore
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Old 01-15-2015, 07:09 PM   #16
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Agreed that it is probably a CYA maneuver. Engineer here as well!!! With a surge type brake it is the tow vehicle slowing down that causes the dolly to push and compress the tongue of the dolly moving the piston to engage the brakes. With electric brakes the dolly brakes would usually engage first and instead of pushing on the hitch it would be pulling on the hitch.

I really don't see one as that much better than the other. Either could be putting stress on the hitch and the frame extensions.

by the way who engineered that connection? I didn't measure my frame extensions but they must be 8' or more. Even with all that the actual connection point between the real frame and the extension can't be more than 8" to 10". That's a heck of a lot of lever arm on the connection.
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