Yeah Beddy MK / MJ with a signals body conversion make very fine campers, as does a 101 ambulance or with the signals body or the "vampire". Seen quite a few 127 rapier ambulance campers too.
Avoid the TD5 engine like the plague, fine for civilisation but if the electronics throw a wobbly in the back of beyond ( and they do it's a land rover after all) you're screwed. 2.8 izusu/daihatsu conversion is good in landies as is the 3.0 Mazda/Nissan unit too.
My choice would be a 200/300 series TDi disco for comfort, or a classic rangie ( not any newer rangie as they are just not reliable) go for the 3.5 v8 on SU or Stromberg carbs rather than fuel injection. Manual transfer box rather than a Borg Warner viscous coupling beastie (the chains snap) LT77 manual Gearbox is more than reliable provided it's been modded (manufacturing fault) but I would go for a ZF 3 speed auto box as, provided its been serviced they are bullet proof. Ditch the viscous coupling fan for a kenlowe ( bit carry the old one as a spare). I'd fit a winch so you can self recover and you will need at least 2/3 big tree strops, a couple of snatch blocks too and a shed load of shackles ( o ring type not D as the Ds can seize) to go with the winch. I'd go for steel rope over plasma rope for reliability a sake, you can melt plasma rope, if you have melted the steel one then it's the least of your worries at that point! You need all the strops and shackles because you may need to pull yourself out in reverse from an obstacle or slide the beggar sideways. Learn how to use the winch SAFELY before you go!
Defenders are all for the "out of Africa" look but unless you are 5'6" or smaller they are bloody uncomfortable distance wise I love them to bits but they aren't really tourers.