I find that after you get used to the Prodogy you can tell by the feeling when you brake
wether you need to adjust it up or down a bit. I do turn it down a bit in town to stop lock up.
On the highway I have them set at about 4.6 and 4.3 in town.
This works with my truck and trailer combination, every vehicle / trailer will be a little
Also the other variable is inertia, the harder you tend to brake the harder the
trailer brakes come on so if you tend to be light on the brakes you can use a higher setting,
if you tend to run up to a light and hit the brakes harder you will need a lower setting to
prevent lock up.
Inertia based controllers tend to take a little time and patience to set
up perfectly for your driving style.... but once you dial them in or have used the old
timed ones you will love them.