For the kegs that matter to me, I tare the empty weight (~8lbs) then weigh the keg and calculate the mass, and hence volume of beer via the FG. #sciencegeek
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Something else to consider for a charcoal smoker would be a pit barrel cooker. I got one a few weeks ago, and plan on doing a full review on here in the future.
One basket of charcoal burns for about 12 hours, once the cooker is dialed in. I had an offset smoker, which required constant tinkering to keep the fire going right. Ended up warping it badly by tying it down in my truck, got so bad it would never hold temp. Got rid of it about a year ago, and finally got my new cooker a couple weeks ago.
One of the biggest reason I went with the pit barrel cooker is it's ready to go out the box, and it's completely self contained. All the parts store in the cooker, and there's even room for a bag of charcoal and my charcoal chimney. The entire thing is easily lifted into my tuck's bed, and ties off with a couple of bungie cords.
Just pour it in, it will be fine. Be sure to anticipate it may end up drier that you expected.