I use mod_rewrite/.htaccess for pretty URLs.
I\'m using this condition/rule to eliminate trailing slashes (or rather: rewrite to the non-trailing-slash-URL, by a 301
change the rewrite rule to:
RewriteRule ^(.+[^/])/$ http://%{HTTP_HOST}/$1 [R=301,L]
in English: match the start of the string, one or more anything, NOT a slash, a slash, the end.