To move the respawn marker, which is what I assume you're using, just use the setMarkerPos command.
"respawn_west" setMarkerPos [x,y]
(or is it "west_respawn"?)
Replace west with whatever side you're really using, and [x,y] with the real coordinates.
You can move your vehicles with the setPos command. Just move them to the appropriate locations as well. E.g.:
tank1 setPos [x,y,z]