Here in Michigan alot of big 8 axle dumps or some type of train setup. All we have is tandem hopper bottom though. That's Considered small here anymore.
You know this is spit balling but maybe check your gas regulater if it's propane it may have got alittle liquid in it or has a lazy spring and diaphragm IDK fire is a triangle so it's either gas air/vent or ignition
