Issues with my LEGO Land Rover Defender - Rear Wheel Keeps Popping Off
I've read about someone having exact the same problem with the 42030 (Volvo L350 F wheel loader) years ago. And basically, the wheels aren't that different with this model.

Apparently, people sometimes don't realize how much force they need to use to click the wheels on. 

The problem is with these pieces:



fitting in these pieces:



You need to use much more force then you ordinarily do building a Technic or other LEGO set. You need to hear a very audible "click". Afterwards, its very hard to separate the pieces without damaging them.