Just one trip! Here's what goes on dolly:

gig bag with PSR-S900 and tupperware with headset mic & cables
keyboard stand
2 fbt speakers
bag for power and audio cables.

No need for mic stand as I use a headset
No need for speaker poles as I angle them up on the floor.

I have speaker poles that I keep at home and usually use only on higher profile gigs.

Beakybird