So you ask some good questions.
I guess I wonder where the folks fit that have a rig that is built above stock AF (That is HILARIOUS btw) and sportsman C. So bigger than 37's, no longer has stock axles, kind of thing. (Looking at sportsman C it looks like that class requires Harnesses and window nets...)
The next step for a new guy that has trail rig who wants to come and play is sportsman B, which allows rear engine single seat buggies...
Which sounds like a completely different world than a full bodied trail rig with tons and 40's...
I guess in my head either bump the tire size in sportmans A to 40" & create the Sportsman "AF" class (silly laughing on that one) or make a trail rig class for those who have stock frames, stock suspensions, (leaf, coils, long arm ok, no coil overs/air shocks) up to 40" tires.
Am I the only one seeing this whole in the classes? When we lead trails at the W4x4J it seems like most folks who are commited to this sport seem to be running a minimum of 38"-40" tires (or trying to get there)