Hi Steven,

A stock Jeep can typically attend 'D' (No 4WD) and 'C' grade trips with no issues, 'C' will require a recovery point front and rear though just in case. 'C+' and up are more suited to modified Jeeps, so A/T or M/T tyes for C+ and ideally a little suspension lift although if you run a Rubicon JK then stock is fine. 'B' trips and up is basically more lift, larger tyres and traction aids like a locker or two although the lockers aren't required. 'A' grade a rarely run b ut it's everything goes with lift, muddies, lockers, winch etc.

Dont be put off though, if you're not sure post up that you want to go and ask whats required if it doesn't say, sometimes a 'C+' trip can be negotiated by a stock Jeep if you dont mind going through a bypass or being snatched once or twice.

Cheers
Steve