As well as the memorial decal, the family wears tribute T-shirts and bracelets with a special inscription that reads: "Don't give up, humility, courage and sacrifice".
Lafoga, who narrowly cheated death in the rip at Bethells Beach that claimed the life of his cousin, says it is important to remember the heroism Sonny displayed rescuing his younger brother before he was swept out to sea.
Speaking for the first time since the tragedy, he says the group was quickly dragged out to sea by a strong rip. He tried to swim out to rescue his cousins but Sonny told him emphatically to get back to shore: "He was going to save Gillesbie."
Lafoga says it feels like Sonny is still around.
"Every day I think about him. It always feels like he's around and it's just our own reminders. It's just hard to forget him. I take courage from him. That's why we have it on the back of the vehicles, to show our faith we have."
He also has a portrait of Sonny tattooed on his chest. And while it is difficult to admit his best friend is no longer alive, he is inspired to turn the tragedy into something positive. "He's given me a better reason to live life."