The Traveler, from Hackmaster's Tellene (published for 3.x as Kingdoms of Kalamar), has a lot in common with Fharlanghn. Consider that a lot of his worshipers will be caravan guards and travelling merchants.

While Divine Masters from Kenzerco has a lot of details on the faith, consider what a priest of Fharlanghn is going to oppose... things like banditry, pirates, and other things that make people unwilling to travel.

Someone mentioned "Road Goes Ever Ever On" from the Hobbit...