Extended Realism Mod for RTR Platinum (ExRM) is very good and they have just recently released a new (final) beta version with completely redone map and factions, seems very promising! Sorry I do not provide direct link, but TWC is not accessible for me at this moment (do not know if the problem is on my or their side). ExRM is hosted on twcenter.net

And here is a gameplay video from the new beta https://www.youtube.com/watch?v=59XZlY14Dqs.