i have 4 gas birds flying and none of them have the expender
one does have 2 receiver as it was set up 7 years ago when 8411 was king (2 rec, 2 batteries, 13 servos)
my 46 ultimate is running one rec, one battery, 9 servos

i did what was confortable for me
the cap is running 7 servos one rec and batery