what does the small yellow suzie do that ive seen INSIDE cabs?? seen it coming from dash and overhead dash area!?!
Some people use suzies just as an air line really to blow air/dust from the cab, I know switchlogic on here does and it can be seen in his videos.
…and for inflating the *missus whilst away from home but don’t fill 'er up too much or she’ll blow her top.
*Or bloke,for the wimmin out there.
Inflating your ‘spare tyre’ 
They are only used for blowing the dust around the cab, not for cleaning it 
Wheel Nut:
They are only used for blowing the dust around the cab, not for cleaning it
They are ok on a breezy day with both doors open, but otherwise that’s about it.