well classifieds has its own SEO
rewrite so I cant comment on vbSEO
hacks or mods as those are not needed in my opinion.
I can tell you that normally any issues your going to have are because of vbSEO
. You would normally have issues I think if you try to install classifieds in a subdirectory of your forum because its going to try and mess with our program because of its htaccess file.
For proper operation of your forum with vbseo
and classifieds not to be interfered with by vbseo
you would install your forum like so http://www.mysite.com/forum
and classifieds like so http://www.mysite.com/classifieds