> The Dealers section requires a password to login. I have 
> authorised online access but would like to d/l the dealer 
> pages for easy reference offline.

Did you see this in the FAQ?
Q: Can HTTrack perform form-based authentication?A: Yes. See the URL capture
abilities (--catchurl for 
command-line release, or in the WinHTTrack interface)

The other way is with cookies which has been repeated a lot 
in the forum and is "sometimes" successful.