No safari roof - we have had a number of cars with sun roof's and barely used them in Qld, the sun it too bright and hot
Good general use options:
Side steps - don't know if the after market ones are compatible with the side protection rails
Checker plate on the front - didn't get the in the original order, but they are surprisingly convenient to put things on, that would otherwise scratch the paint
Roof rack / platform - sitting on the roof is a good place to get away from everyone
(full length platform isn't compatible with safari windows)
Roller for the rear of the roof rack/platform - the car is high so a roller to load longer, heavier items (tents, kayak, portaboat) will be useful (often used by tradies for loading ladders)
Expedition options:
the usual necessities offered by Ineos, including tow bar, double battery, bull bar, side protection rails ...
Front and rear lockers - being solid axle I prefer this to be done in the factory
Winch - for solo expeditions (i have no friends - can also be used to rescue others and make friends, or at least get given beer)
Side track-mount brackets for additional fuel &/or water, without adding height, roof loading or taking up internal space (something like this -
https://expeditionhq.com.au/product/xspec-30l-gravity-feed-diesel-tank/)
Will also look at heavier duty after market under body protection
Window block-outs - will probably make my own
Haven't really checked out the lighting on the Grenadier, so not sure if additional driving lights are needed