Hi @cjg79
A post object has ‘post_title’ variable which you can get like this:
$trip = get_sub_field('trip');
echo $trip->post_title;
This page should give you more idea about it: https://codex.wordpress.org/Class_Reference/WP_Post.
To learn more about post object, please take a look at this page: https://www.advancedcustomfields.com/resources/post-object/.
Hope this helps 🙂