I have a square tube smoker, one nice thing about it is that it fits under the grate on my gasser, sitting on top of the flavorizer bars.... squarely
https://www.amazon.com/exec/obidos/ASIN/B01KNF9ZNY/tvwb-20
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Filling tip:
Take an old barbecue sauce bottle (wide mouth, plastic) and cut it off just below the shoulder. It makes a really handy funnel for almost nothing. It also helps whe filling spice jars or pepper mills.
I do the same with large soda bottles if I need a disposable funnel too but, I'm still using one I've had for about two years since it hasn't failed yet.