I've heard somewhere that the money would be allocated to repairing something like 240 miles of existing fence, and creating another 100 miles of fence/slats. I don't know whether to believe that.
But the open debate has been purposefully obscured by both sides. The Democrats definitely do not want a 2000 mile concrete barrier, which is what Trump campaigned on. Trump is being evasive and/or stupid and does not seem to articulate exactly what he is proposing. He hints at something different from 2000 mile concrete barrier, but never actually states what it is.
If he came out and said, "look, I am not building a wall. I want to add 100 miles of fence to these key areas." Then I think he might get it. But he needs say it clearly, and out loud, and in a proposal to Schumer and Pelosi. If they reject that clear offer, then I might start listening to whether the Dems are being spiteful or unreasonable.