I have my second battery installed in that position with a good isolation system and a dash switch so I can put both batteries in parallel in case the main one dies on me (great for cold starting). I had my jack moved to the back-side of the drivers-side shock tower.
Rear springs are a little soft when fully loaded on a D1 - it's worth seeing about getting uprated springs.
It's really worth looking at real off-road shocks as they cope with the heavy going up north (Savannah way or Gibb River Road for instance). I have Bilstein shocks on mine and they're brilliant. They've lasted for over 200000km so far and I've done about 40% of that on the dirt.
I also carry a second spare on my roof rack, but that may not work well with your roof-top tent. Whenever I have gone for a long trip I've needed that second spare ...
Norm
2011 D4 TDV6 (Audrey)
99 Defender 130 single cab ute 300Tdi (Mabel)
99 S1 Disco Tdi (Grumble)
-ex 97 S1 Disco V8i (Beast)
-ex 94 Defender Tdi (Antichrist II)
-ex 98 S1 Disco Tdi
-ex 78 Strangie (The Bucket)
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