Hey Grant,
Good question. Given the number of variations this tag will load (secure dev, non secure dev, non secure production, secure production, etc) I would suggest creating a Tealium Custom Container Tag for this.
Add a Tealium Custom Container Tag
Save the profile so it pulls in the tag template
Open the tag template for the new Custom Container tag just added
Open the Tag Configuration Section
Open the Advanced Settings section at the bottom of the tag configs
Click the "Edit Templates" button at the bottom of the Advanced Settings
Replace lines 113 - 120 with this:
/* Start Libloader Function Call */
/* Un-comment the single-line JavaScript comments ("//") to use Libloader. */
utag.ut.libloader2({src: (iatDev = (window.location.href.indexOf("iatDev=1") > -1 || document.cookie.indexOf("iatDev=1") > -1), "//" + (window.location.protocol == "http:" && !iatDev ? "h" : "") + "j.flxpxl.com/111111.js?r=" + Math.random() * 1e16 + "&m=992&a=111111" + (iatDev ? "&d=1" : "")), cb: u.myCallback});
/* End Libloader Function Call */