I started mine I have ? on breaker ground

Hi All:
I picked up my 6x12vnose haulmark transport two Frdays ago.(interior 5.5 x 13) wish had my camera but my wife took it with her to see our 1st grandson.(2months old).I started today pulling the walls down ...I'm glad I did, The wiring coming in from lights some had nice rubber groomets to protect the wiring comming thru the hole some did not.,Glad I caught that.
I am going to put in the insulation,and start to run the wiring, If I mount the box to a wall stud (metal frame} will this ground it out? (I do have a ground bar in the box also)I am going to ground all the GFIC also. Will this work.I will have no battery power : I read a whole bunch of topics on it',and it seems as long as you test what your plugging into at the campground you should be good to go.
Thank you
I picked up my 6x12vnose haulmark transport two Frdays ago.(interior 5.5 x 13) wish had my camera but my wife took it with her to see our 1st grandson.(2months old).I started today pulling the walls down ...I'm glad I did, The wiring coming in from lights some had nice rubber groomets to protect the wiring comming thru the hole some did not.,Glad I caught that.
I am going to put in the insulation,and start to run the wiring, If I mount the box to a wall stud (metal frame} will this ground it out? (I do have a ground bar in the box also)I am going to ground all the GFIC also. Will this work.I will have no battery power : I read a whole bunch of topics on it',and it seems as long as you test what your plugging into at the campground you should be good to go.
Thank you