Klaus
First Post
I knew that sounded familiar!"Wickett's Thicket of Wicked Widgets: A Gaming Phenomenon Nine Years in the Making."
Wait, wrong board.
Cool, thanks for the thoughts everyone. Since I've already got everything clear in my head for the adventure, I think I'll give that a shot, and maybe try playtesting my other ideas with my own group.
If I do write up a Cavalier (an idea which, honestly, Klaus put in my head), I'd probably put in a section for dealing with dungeons. Hopefully something more substantial than, "If you prefer a serious campaign, try not to use adventures where horses can't go. If you are cool with silliness, then use these simple Pokémount rules...."

I don't know if a Cavalier/Knight/Rider would work as a full-blown class. I think it'd work better as a "multiclass-only" class (akin to the Spellscarred, or the Weapon Mastery feats) to add Controller-ish powers to any martial class. This way you could make Mongol-like archers (Ranger Riders), heavy European brigades (Fighter and Warlord Riders), Arthurian Knights (Paladin Riders) and hit-and-run scout types (Rogue Riders).