Fantasy Football Keeper League Trade Question?

Should I trade Shaun Alexander for Maurice Jones-Drew and Brandon Jacobs? This is the 2nd year of a 3 year, 10 team keeper league. My other backs are Jamal Lewis, Tatum Bell, Ladell Betts and LenDale White. We can keep UP TO 4 players. I also have Peyton Manning and Steve Smith as keepers. The league is a heavy scoring league(6 pts. per TD).