I know that it's possible but I'm having problem when I want to enter the folder with 'index.html / index.php', it automatically redirects me to the site, instead of opening the folder. You can test it here.
http://svamservices.com.au/truck/ (archived version) And try entering the main folder.
I would like to get the contest of the main folder. Any idea? I tried with wGet but it just skips the main folder.
wget http://<bigcompany/
would mean you could read a lot of data you're not supposed to read.