Do I need to lube my wheel bearings?

[kikkegek]

he guys,

I have a 1986 K20 Suburban (see my sig).

we use it as our daily driver and I do most maintenance myself. Just finished lubing the whole car...and now I am wondering if I need to lube the wheel bearings?

we drive about 20.000 km per year (12.000 miles)...

My Haynes only says in 2WD versions to check and repack the front wheel bearings every 30.000 miles.

So are my wheel bearings maintenance free?
this is what my rear wheel looks like:


this is what my front wheels look like:


hope you guys can help me.