Help with Rover Sitl

I am using Rover 4.2.3 in the sitl from Mission Planner. I am trying to test the skid steer option, but I don’t know if it’s supposed to be this way or maybe I misconfigured something. It can go forwards, although it curves a little, but when I try to go backwards, it just starts spinning.
This is the parameter file I am using, can someone give it a look?
param_skid_steer.param (20.1 KB)

I had the same issue with SITL. And gave up. I let the rover in SITL keep its default motor and rudder config and did not waste any more time on it.

When you started saying you had the same issue it gave me a little hope then I read the next phrase.
I hope one of the devs see this post and can give some enlightenment, that unless I messed up in some way I am not seeing, like another parameters influencing this behavior, I don’t see how to fix it. I even used the frame skid steer for the simulation hoping it could work.

can someone please help?