Ok,
I am a bit confused. I see you say you are in SW NH but Rountree Ford according to Google is near Lincoln NH.
If you are in the Lincoln area you are near UncleJunk and Ron'sPowerstroke. Send a PM off to Ron or unclejunk. They are both NH chapter members and are probably willing to help point you in the correct dirrection.
If you are really in SW NH than send a PM to Big Ken. Sure he's in Ma but I think he might be able to point you in the correct dirrection as well.