Ive recently found a 250 gallon tank that is one half of a 500 gallon butane tank. I am wanting to try my hand at turning it into a reverse flow smoker but I wanna put a slight twist on it n include a small charcoal pit for grilling burgers. But my first concern is how to start and how big my firebox needs to be and my smoke stack. And how big of a trailer should I try to find. All the help would be greatly appreciated.