That might do the trick, but there's actually an easier way to return the Everest's computer to the factory standard settings. It goes like this:

Start the vehicle and make sure it is in Park with the engine running. Then press 'Settings' on the SYNC screen. Then choose 'General' and scroll down to select 'Master Reset'. At this point, you should get a message on the screen that the reset will erase all previous settings and factory defaults will be restored. By pressing 'Continue' you're agreeing to this and you should then see the screen go blank for anything up to a few minutes while it reboots.

We haven't had any feedback on the issues you mention, but have had complaints of poor build quality. Your problems would seem to be because of build quality issues.

All of the vehicles are worthy choices, but you need to be careful about the towing ratings of them. The Kia Sorento, which would be my choice, is rated at 2000kg, which is right on your towing requirement. Others, such as the 2WD Everest, are rated to tow much more. Others, like the Mitsubishi Pajero and Toyota Prado, are full-on 4WDs, and would seem beyond your needs.