This is a sim. I don't spend a lot of time on the farm sim boards but racing in mudrunner is about as suitable as asking for vehicular combat in farm17.
I'm not denying, in OldTires while trucks were limited to 30 km/h, it has fun makeshift rally races. It was not about "how fast you driving trucks", but "how good are you at keeping up speed/momentum" or "how long you will stay on those 200 L". And when loaded "blue crap" B130 is outrunning your empty 4320 or 255 this was treated as offensive as flipping bird at you.
In MR that not the case, because of revamped muds and dirts and also revamped truck's performance. But still - getting anywhere on pre-ridge 968m was an achievement on it's own. I've got once this chat:
— (me, upon meeting another player from woods) I've came to cheer up on you!
— (co-op player, struggling on C-tier truck on soft as mash road) - you and your f'ng car...
So, when I feeling like it, I'm "racing" as in "trying to outrun" on weaker vehicles or under heavier loads.