There is no doubt the San Francisco 49ers are interested in adding a receiver.They checked in on several during free agency and the position is expected to be an early priority in the May 8-10 draft. So it's no surprise that in an Insider piece, Field Yates, while proposing five trades that makes sense, explains why he thinks the 49ers should acquire a receiver. In Yates' first proposal, he has the 49ers trading for Houston receiver Andre Johnson.