When I play in another church I ask if i have to bring my own keyboard. (kurzweil sp-88x/52lbs.+30lbs. of the hard shell case = 80+lbs.) Including cables and pedal, sometimes even the stand. If they say no then i just take my sustain pedal because some churches don't have one or the they have is broken.
Everyone musician should take at least the main things that they really need.
key players: keyboard, sustain pedal, and bible.
Drummers: sticks, snare, and cymbals and bible.
Bass player: Bass, tuner, strap, and bible.
Guitar players: Guitar, tuner, strap, pick, and effects pedal and bible.
Some musicians don't even bring their bible. Why?