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I've not marinated a chuck prior to smoking yet, so can't say what would be a good way to go for that route. I dry rub most all my beef, but for the most part I base the salt content of my rub on how much interior fat the cut has...more fat = more salt. Salt draws out water out, and this seems to help breakdown fat. The flip side is, heavy salting of lean cuts can cause some dryness to occur.