WOW..that is a fair radius...and also includes the Glasshouse, and certain Bastard bog holes there, not to mention that bastard Big red (or even his little mate) or Ballbearing track that is uphill, steps but all on marbles, Plus you got the Islands (Frazer and Morton), thats soft stuff at Inskip and DI point and beach tracks as well with powder sand...so what to recommend..OK...4WD Action on Youtube with Shaun and Graham...they go there lots, and sure, its scripted, set up and staged a lot for camera and flogs the gear from their sponsors, but generally it will give you an idea of what you could be getting into, and what breaks can...and generally will happen.
https://www.youtube.com/channel/UCs-...2ky3oImX83S_2Q
For myself..(even with a heavily modded rig...now up in the mountains with the engine in piecesfor the time being) My recommend is to take a leaf from my tree...I am captain chicken line, I don't go for bounce up , send it , bonus line heroics, I crawl and let the rig and its torque and suspension flex and traction lock do the work (until I got to send it...LOL) as smart lines and great throttle control will save way more dollars than mad mods do...and leaves a great powerhouse rig in good nick to do the recoveries of the superhero wheelers...and that gets beers!
As for track ratings and grading, mate weather and season can change these week to week, so you may find this helpful https://tracks.4x4earth.com/ as a guide for what you are safe to pick vs what you are likely to break.