I made a bunch this past fall that turned out really good. I used Dale's Steak Marinade.
I used 50/50 water and Dales( probably a bottle)
1/2 small bottle of liquid smoke
1 tbs of each - granulated garlic, onion pwdr, blk pepper, red pepper flks
Then let marinade for 1.5-2 days.
This was for 5#'s of thin sliced round, I think I used bottom round. Can't remember.