i usually have my wife stand where i want back of TT to stop. i roll down the windows and if i hear her scream i know ive gone back to far....
all joking aside she does a good job of directing me but just can't grasp the fact that i constantly have to remind her of.
if you can't see my side mirrors, i can't see you. after we get it where we want it and start to setup she asks "what can i do to help?" my response is check your emails, facebook posts, and texts. while i setup, then she gets the inside ready, when we break down. she always squares away the inside while i do the outside
works for us