Need some advice on trade please?

So I’m contemplating sending an offer for ertz

Trade would be
I get:
Ertz and d.montgomery

I give:
Coleman and Olsen

My other rb’s are freeman, Carson, Singletary, pollard and mckissic

Dynasty or redraft? PPR or non-PPR? Starting lineup requirements?

1/2 ppr, redraft,QB, 2wr, 2rb, te, flex, k, def

In your case I prefer Coleman and Olsen over Ertz and Montgomery.