Don't mean to flame too bad here but is the full time 4WD really that necessary?
I understand the benefits of having the center diff, but it's really not that big a deal to drive in part time a little while you are off road. To give a little perspective, everyone is complaining about not having a manual transmission.... well how would I ever know what gear to be in? There are 5 of them!
I can see why Toyota dropped half of the 4wd modes, no one knew how/when they were supposed to use them.
Well, for me, off-road, i can do with part-time system. In my Mercedes, i lock the center diff 99% of the time off-pavement (similar to shifting into 4HI/LO in a part-time system)...because i don't want some other factor to decide how to shift power back and forth b/w the front and rear axles (Torsen diffs, in itself, can sometimes make mistakes off-road)...i want pre-determined 50/50 split because i can read the terrain (off-road) much better than any computer ECU (thus, my criticisms of Land Rover's
over dependence on the Terrain Response system.)
The rare moments where i have to make a sharp turn in dirt, i unlock the center diff (similar to part-time system switching to 2wd)...and in these rare moments, you really don't need 4wd (and
IF you do, then your vehcile is too damn big for the trail...so get the hell off it!!).
For me, the off-road aspect of a full-time system is less important. However, ON-ROAD, i think that the multi-mode 4wd system of the 4th gen 4runners (and Limited 5th gen) is where some people feel better about having it. For me, yeah, it is nice, but is it really critical to safety? Maybe, but having all sorts of electronic nannies (VSC, TRAC) and good tires are more important.
Don't get me wrong, i think that the 2009 4runner Trail to be an awesome find and keeper (see my previous posts gushing about it!). However, if you're into off-roading, then i would NOT shy away from the 2010-11 4runner Trail simply because of the part-time system. The 5th gen offers the improvements noted above. In addition, the rear diff is bigger/stronger i believe. The suspension is mildy redesigned for smoother ride (according to Toyota press release). The frame is stronger (a possible weakness for 4th gen's kissing cousin, FJ Cruiser...so, does the 4th gen have this too??). In other words, Toyota had close to 7 years to analyze the 4th gen's weakness and improve upon it structurally and mechanically. Ground clearance, off-road angles, power, etc. are better in 5th gen. Although the interior is cheaper in materials, it is roomier and less gimicky. For me, i care more about a stronger built vehicle than the transfer case...hey, as long as it has 4-Lo, rear locker, and A-TRAC, i am good to go!

But, if you end up with the rare 2009 Trail Edition, then i envy you just as well! :cheers: