There is one key lesson that I would take to heart. Be wary of using any type of proprietary system without thoroughly evaluating its future viability. The Open Road Forums is a good example? Custom coded solution due to some unique feature requirements, it apparently relied more on patching over the years, then a concerted migration plan as it was no longer supported by its original developers.
I went through a similar situation last year, when our proprietary enterprise system became so outdated, though cutting edge in early 2000s. Yet no longer supported by its developers, nor compatible with current Windows Server OS, as previous OS versions no longer supported with MS security patches. Worse, with no easy way to extract archived files as it used a proprietary system storing raw data in its own format.
Can't really comment on your situation, as need to see your site? Though looks like you've determined the need to upgrade to a different system?
Would a blogging (or CMS) system work such as Wordpress or Blogger.com? You can add/edit/delete content on the front-end from a browser, without having to do so from back-end if using HTML? Another advantage being you don't have to install these yourself as they are available ready to use.