Mod-rewrite Trailing Slash Issue

RewriteEngine On
RewriteBase /bookkeepers/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)/?$ index.php?franchise=$1

http://example.com/location/kings-lynn

http://example.com/location/index.php?franchise=kings-lynn

http://example.com/location/kings-lynn/

franchise=kings-lynn/

RewriteRule ^(.+[^/])/?$ index.php?franchise=$1