I forgot how to embed a file and still have the custom field variables work for that entry. I know it is because of the parsing order, buy can someone remind me? Here is a simplified example:
{exp:channel:entries channel="trips" limit="1"}
<div id="contentarea">
{embed="includes/sidebar"}
</div>
<!-- /content -->
{/exp:channel:entries}
Inside sidebar I would have calls to fields, like so:
<h1>{title}</h1>
<h2>{trip_type}</h2>