well for mine u had to just a little.i didnt mean drop the headliner all the way down,just a little so u can run the wires.why ty is there an easier way.
does it have the huimps near center, if not drop overhaed light if it is near center, use 1/8 or 1/4 wood strips between headliner and roof, then fish a coat hanger from either side of truck to opening (light). mount the bracket to roof, connect the wires(and tape connectionsa) then mount the tv to the bracket.