Help: Need an RB in Trade!

I picked up Mack and Williams on the waiver wire this week since Bell is on bye. I am 4-4 in a full PPR league. I want to trade for a good RB2 this week and my starters are pretty lackluster. Which players would you package together to get someone in RB2 range and more reliable?

bumping up! too general of a question i’m guessing?

You can try JuJu and a RB but you might have to see what you can get for Bell if you really need a win