Griff Allen hosted the 2005, 2006 and 2007 SEMA Show Proving Grounds and the 2006 and 2007 SEMA Spring Expo / SEMA Off-Road Proving Grounds. At both the 2006 SEMA Show and the 2007 Spring Expo, he interviewed Ivan "Ironman" Stewart. At the 2007 SEMA Off-Road Show, he moderated The Performance Diesel Panel - made up of Mark Williams, editor of Truck Trend magazine; Kevin Wilson, editor of Diesel World; John Waraniak, SEMA Vice President of Vehicle Technology; Harald Hanks, BD Diesel Performance; and Ron Knoch, then from the Diesel Hot Rod Association (DHRA). At the 2007 SEMA Show, he appeared in a televised segment with Will Castro shot for Speed's Unique Whips.