II was an Admin/Moderator on LRUK for years, and although it had 15 times the membership of TM, we had a large pool of admin/moderators who had specific roles, but were also able to jump in and support in other areas. That way, the job wasn't too onerous, and the membership benefitted as a result.
May be worth adding a couple of new moderators to TM who can help wth the day to day running?