You sound like where I was at approx 3 yrs ago when I bought an LR3 and sold my Tacoma 4-door TRD -- although my Taco was just 2WD.
My wife and I were getting into camping/overlanding a lot more, and in my case, the 2WD was limiting -- hate to turn back just when things start getting interesting.
The main reason we got an LR3 was because there were some bear attacks in campsites in areas we visited (really an aberration, but it got in my wife's head), and an LR3 easily folds down rear seats and the cargo area will accommodate a double air mattress, so it's easy to camp in the vehicle. In fact, we don't do that much, but it's nice to have the option. We could have made an FJ Cruiser or Wrangler work in a pinch, but it seems they have a market bubble, in terms of resale prices, whereas an LR3 was simply more affordable. After 2 1/2 yrs of adventures, we're very pleased with the LR3.
Given your topic, you might be interested in some camping/adventure reports I've written here that address the topic of great camping trips in 4 corners area in a Land Rover.
Hunts Mesa:
http://www.expeditionportal.com/forum/threads/131489-Navajo-Nation-Hunts-Mesa-trip
Utah Canyonlands / Maze:
http://www.expeditionportal.com/forum/threads/116117-First-Utah-trip-(Maze-and-Cedar-Mesa)
KofA Wilderness:
http://www.expeditionportal.com/for...-you-have-3-days-and-nights-in-the-wilderness
Swansea ghost town:
http://www.expeditionportal.com/forum/threads/123949-Parker-Swansea-AZ-Wanderings
Vermillion Cliffs:
http://www.expeditionportal.com/forum/threads/126141-No-Wave-No-Problem-Vermillion-Cliffs-Report
Ragbrai:
http://www.expeditionportal.com/for...miles-bicycle-ride-across-Iowa-7-days-camping
As was previously mentioned in this thread, if you stay on top of maintenance and aren't afraid to do some wrenching, an LR3 can be reliable - at least it has been for me. There's a good online community for DIY troubleshooting and maintenance/repair. I've done all fluid changes (diffs, xfer case) myself, but had an indy shop do the transmission flush. The only other thing I've had done at a shop was bushings, and that was solely due to bad timing when I noticed it just before a Mohave Trail trip and I had available money in the car maintenance budget. (I.e., a couple local LR3 guys have done DIY control arm replacement and said it's not terribly difficult). Also replaced a couple air suspension shocks and a height sensor. Fixed a leaky drain from the sunroof and other misc. I was never a mechanic kind of guy, but when I started to get into this hobby more seriously, I figured I better learn how to work on the vehicle.
If you do go the LR3 route, I'd be glad to provide some more suggestions about IID tool (for monitoring, diagnosing and resetting ECU related things), links for tire considerations, etc.
Good luck, and see you on the trail!