After a while of trying it and testing, you'll be able to lift it and get a general idea of how much is left.
I have now typed this sentence 7 or 8 times trying to figure out how to say this without seeming snooty or self-rightous, so you'll forgive me if it seems self involved
True BBQ=SMOKE+TIME. Buy a chimney(metal cylinder with wooden handle) and a basic non-gas grill. Go to your local bookstore and buy "The Barbecue Bible" by Steven Raichlen.
Its much more involved and more time, but for the best BBQ you've ever had, this is the only way to go.
Page 242.....Beer can chicken. WOW! just WOW!