Moto Racer 2 and 3 are "coming soon" on gog.com. So From which version on can I configure high resolutions (1600x1200)? Or are all 3 to old for high resolutions?

If any of them supports higher resolutions, it would be 3, the others are simply too old.

A quick check online indicates that Moto Racer 2 supported resolutions of up to 1024x768.

The Moto Racer 3 Demo's configuration utility supports resolutions of up to 1280x960 (screenshot attached). This might vary by computer, but that's as high as it went for my screen (1680x1050).

Confirm - MR2 supports max 1024x768 + it also supports 1024x600 (widescreen) on my netbook, but no widescreen resolutions on my desktop comp.

MR3 goes up to 1600x1200 on my system. It doesn't support my monitor's native (widescreen) resolution of 1920x1200, but I'm used to playing older games with black bars on the sides, so it's not a problem.