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A sensible starting gain from the weight ratio, then the 25 mph manual override procedure that actually sets it, because no formula gets this right.
Every page here is computed rather than written, so the figures match the calculator that produced them exactly. Published standards and rules of thumb are labelled separately on every table, because on this subject they are not equivalent. Every table is plain HTML you can quote.
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The Echo with a physical manual override button included. Sway response depends on being able to apply the trailer brakes alone, instantly, without unlocking a phone, so this is the version worth the extra money.
Best for: Anybody buying an Echo who intends to tow a trailer big enough to sway.
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Plugs in between the truck and trailer connectors with no wiring at all, and is controlled from a phone. It moves between vehicles in seconds, which is the entire point: a rental truck, a borrowed truck or a second vehicle needs no install.
Check before buying: Manual override lives in the phone app on the base unit, which is not where you want it when a trailer starts to sway. The Echo Kit adds a physical override button and is the version to buy for that reason.
Best for: Towing with a vehicle you do not own, or with more than one vehicle.
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Configured from a phone rather than through a two button interface, and it supports four axles, which matters on a triple axle fifth wheel or a heavy equipment trailer.
Best for: A four axle trailer, or somebody who tows several trailers and wants saved profiles.
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The control head is a single knob that mounts flush in a blank switch panel, with the electronics hidden behind the dash. On a modern truck with no room under the dash for a brick, this is frequently the only tidy answer.
Best for: A vehicle with no space for a conventional controller, or anybody who does not want a box hanging below the steering column.
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