Ok I was going to use a 275 gallon fuel oil tank as a trailer mounted smoker. I have decided to go a different direction (anyboy in Ohio want a 275 gallon fuel oil tank? CHEAP!) Anyway, I have a line on 2 60 gallon air compressor tanks and a 30 gallon tank. I was thinking about mounting the 60's side by side and making them both reverse flow, and then using the 30 as the firebox for both. I am pretty sure that I had seen somebody doing something similar. It may have been here. I would like to hear your thoughts on this idea. And again this is all still in the planning stages. And hopefully I can find the charger for my camera so I can post some pictures.