Sadly my response to your post got lost when our site got hacked a couple of weeks ago. Here is what I said then.
Your training terrain should be similar to your race terrain. The VT race is relatively mellow compared to the terrain in the White Mtns of NH. In your race you’ll be required to run more and hike less than if you were on steeper terrain. While there is some gain to be had from a period of very hilly training you should do that earlier on in the program so you can use that strength to help you run faster in the flatter course of VT.
I hope this helps and sorry for the delayed response.