Also for 608 bearing doubters here is a study I made using 608 NSK bearings. They have proven to be very capable even in this most extreme use case as I have documented. To this day this custom wheel set-up I personally designed and had CNC’d for my 4x4 Plutonium is one of my favourite boards to ride thanks to the wide wheels and ditching those terrible stock cheese cutters.
That all said, yes I think its better to go with the mountainboard bearings for obvious reasons, but it’s not always possible and sometimes prohibitively expensive to change the board over.