crossmembers

is 2x2 3/16 ok for crossmembers

just hanging something from it, or gonna have something that has some torque on it? either way i say yes.

gonna use for upper bar mounts and a new rear xmem

youll be fine, chances are your welds will break or your frame will rip before the 2 x 2 does. since factory frames are about 11 ga