Trade for a Backup RB?

In my PPR league I have McCoy and Hunt as my RB1 and RB2, I also had Cook, but with him hurt I don’t have a solid RB backup. I picked up Elijah McGuire but nearly everyone else worth picking up is gone at this point. Is it worth trading some of my WRs or one of them for a backup?

My receivers are
AJ Green
Michael Crabtree
Golden Tate
Davante Parker
Danny Amendola
Taylor Gabriel
Mohammed Sanu

Who would you offer for a solid backup player? I am currently leading the league at 4-1. I’m not sure if anyone would really want to trade with me anyway. Thoughts on who you would target and who you would offer? Thanks!

I thought about offering Davante Parker for Joe Mixon. Thoughts on that as well?