Saw this today on the NASCAR website No. 01 hauler catches fire at race shop - Apr 30, 2012 - NASCAR.COM
The JD Motorsports team, a small team operation in the Nationwide Series, suffered a total loss of their hauler and its contents. Luckily minus the primary and backup cars. The article says they were able to detach the Tractor before it suffered any damages.
"The fire department told me the fire started near the refrigerator on the hauler," team owner Johnny Davis said. "That's powered by propane, like everyone else's is on these haulers."
** Sorry didn't mean to leave out all the 5'ers and TT'ers out there with the title