The GC can come with standard steel springs or air suspension. I have air suspension and rear elsd, no problems in soft sand. Good thing about independent suspension is no diff housing getting dragged.
You can fit a fair bit of protection under the GC. The most important thing is to get rid of the sump belly pan made of out felt covered plastic, I like the chief stuff.
Go to 275/65R18 tyres (32 inch) with a strong side wall, I've been using Coopers STMaxx and they are good in sand and have bullet proof sidewalls.
This gives me 290mm of clearance in highest air suspension setting. I have dragged my belly across coffee rock and erosion berms quite a bit, no damage, rock sliders are a good idea too. Oh and that air dam gets hit on approach, definitely worth getting a lower front guard in there, as above or a bullbar. I've ripped mine off a couple times.