less +F filename will go to the end and tailcontinually load the latest contents of the file.
From less man page:
F
FScroll forward, and keep trying to read when the end of file is reached. Normally this command would be used when already at the end of the file. It is a way to monitor the tail of a file which is growing while it is being viewed. (The behavior is similar to the "tail -f""tail -f" command.)