Remove “-2” from a Toolset Types URL with the same post name

It can be done by using the request filter. Something like this

 function alter_the_query($request) {
       return array('page' => 1, 'pagename' => null);
 }

 add_filter('request','alter_the_query');

Here it forces display of post 1, though of course you will want to do a query to determine the ID. For that, it might prove easiest to first parse the actual URI (from $_SERVER['REQUEST_URI']) rather than use whatever info. WordPress provides (escaping the query string for security reasons, or using prepare()).
Also, you may need some conditionals at the begining so it won’t break editing, archive display, etc.