So to redirect /en/shipper/feed/ to /en/shipper you should be able to add this in your root .htaccess. You’ll have to make sure you put it in the right place so that it gets matched before any other Rewrite rules – putting it at the top of the list of RewriteRule’s should be fine.
These rules assume that you have a standard WordPress .htaccess with RewriteBase /
RewriteRule ^en/shipper/feed/$ /en/shipper/ [R=301,L]
RewriteRule ^en/carrier/feed/$ /en/carrier/ [R=301,L]
I tested a similar rule in a test setup and it works for me.