Quote Originally Posted by the evil twin View Post

I use Tekonsha's but nothing wrong with the Redarc for a Tvan, Cuppa.

A minor correction to a previous post is that the Redarc units use tri axis Accelerometers not Gyroscopes but no biggee.

In auto mode the unit is a fully proportional automatic controller IE it applies the trailer braking effort in the same proportion as the vehicle braking effort without any intervention by the user.

In user mode the braking effort is controlled by the user IE it isn't automatically proportioned so needs to adjusted every time the surface or the incline changes.

In manual override it acts as a drag on the trailer to very effectively dampen trailer sway IE it brakes the trailer but the vehicle can run on.
Very handy if you get gusty winds or some other force that destabilises the trailer.

Redarc or Tekonsha is kinda Ford or Holden really
I find Tekonsha easier to use but not as versatile to mount
Accelerometers. That's the word I was looking for.