I freelance with 3 bands consistantly and another 6 or 7 bands on an as needed basis - the type of gig dictates what I haul. A rock or fusion type may require a larger kit, a country or jazz gig may be a smaller kit.
On the large end, I haul either a 5 piece birch kit (20", 10", 12", 14" & snare) or a 6 piece maple kit (22", 10", 12", 14" 16" & snare). These kits normally are supplemented with a set of mini timbales and varius percussion (chimes, jam block, cow bells, etc).
On the small end, I use a 4 piece mahogany kit (18", 10", 12" & snare)
I have several snares and normally bring a couple both to choose which is best for the room and as a back-up if needed). I also always bring a back-up kick pedal!!!
Cymbals again depend on the gig.
A small gig:
20"
Sabian HH Duo Ride
17" Sabian HH Thin Crash
15" Sabian HH Thin Crash
10" Sabian HH Splash
13" Zildian K HiHats
A bigger gig may also include:
18" Sabian HH Thin Crash
16" Sabian HH Thin Crash
14" Sabian HH Thins Crash
12" Sabian HH Splash
8" Sabian HH Splash
20" Wuhan China
14" Wuhan China
On occasion (mainly rock gigs) I replace the 13" hats with 14" Zildian A's or replace the 20" ride with a 40 year old 24" Zildian Ride. On jazz gigs, I sometimes also use an 18" Sabian flat ride.
Hauling gear is a pain - but that's part of gigging!!!