Camera arms are made so they can move into differant. If you can see the deer coming from a little ways out then move your camera stand into a position where you have a good shot. I try setting up my camera stand up in a spot where I cant shoot then I just move the arms around into the spots that I can shoot. If that makes any sense... Sometimes its better to have a camera stand with longer arms but if thats the case then you might want to have a smaller camera because you might get too much weight on the end if you stretch it out all the way. This is only my second year filming so im still learning too.
Good luck filming, it can get tough if your by yourself.