I've literally just returned from a 4 night camping trip with my 2 door JK. I have the Rhino Rack Backbone tray and am probably considered a novice camper/newbie. Normally, it is just my girlfriend and I getting away for a weekend surf trip. We have managed this efficiently and smoothly. Our weekend kit:
Longboard and short board stacked on the roof rack
Then, I tumble the back seat forward and rope it in with hiking clips (it's actually a motorcycle tie-down for a trailer - works perfect when clipped to the remaining soft-top clips on the roll bar. I run the hard top only). Inside:
1 x 4 person tent
2 x camping chairs
1 x small roll up table
2 x Esky (soft and hard plastic)
Surf bucket/kit with wetsuits etc
1 x 3x3 free standing awning/sunshade. This takes up the most room.
Then bedding, sleeping bags, , clothing bags, food, etc stacked on top of all this gear inside.
Also, I have a small recovery kit, maxx traxx, and compressor mixed in too.
I rope this all down with bungee cords.
Surprisingly, there is plenty of room to spare.
However, this weekend another 2 people joined us. This required that the back seat be available. It definitely limited the space so we just put all of the soft bedding/clothing in a Rhino Rack luggage bag on top. I purchased the Rhino Rack at Autobarn when they had a special happening and went for the "half" bag. It worked perfectly and I highly recommend it.
So, in conclusion, the 2 door is more than capable for 2 people with plenty of gear. Also capable for a weekend away with 4 people and all of the extras that go with that (2nd tent, sports bag, etc.). The only downside was exit entry for the backseat people as we were in and out all day every day, beach driving, etc. However, this will be rare for us as the visitors are from overseas so it won't be a regular occurrence.
Side note: the stock tires are more than capable for heavy sand beach driving. The JK powered through some challening terrain when fully loaded.
All the best.