Have 6.25GB FREE of system RAM to load this? Stay! Otherwise, go buy more - yes it's expensive - but it's worth it if you LOVE this game.
Throw out everything you know about Beamng shoe-box maps and imagine it being an open world where you can roam for HOURS and not have to use the same road unless you specifically want to. I've been modding for 22+ years this is by far my biggest but also by far my best work, a far cry from 'Doom'.
DavidinArk has videos here: