HUSBAND DRIVING DOWN INTERSTATE ANS SEES FLAMES COMMING UP BEHIND HIM BETWEEN THE CAB ABD THE BED. PULLED OVER AND HAD FIRE DEPARTMENT PUT OUT FLAMES. FOR DEALER STATED THAT "SOMETHING CLOGGED THE BREATHER TUBE WHICH IGNITED THE FIRE" TWIN TODDLERS WERE STRAPPED INTO THE CARSEATS IN THE BACK OF THE CAB..