At six foot six and nearly three hundred pounds, with shoulders that barely fit inside an XXL suit jacket, Travis Miller is a hulking wall of a man. He claims to be a “big teddy bear” with a knack for putting even small children at ease, but there is no doubt that he more often exudes intimidation. This came in handy on the football field: Miller nearly made the NFL and then played in the Arena Football League and overseas. But giving off an air of menace, it just so happens, is an even greater asset in his current line of work. Most would identify Miller as a bodyguard, but within the small fraternity of high-priced chaperones who shepherd the rich and famous around the country,…