Why, does a 2wd 4Runner drive better?

I don't need to float on air, I'm just trying to improve a truck that is a pretty good fit for me other than it's hwy handling.
Changing the caster setting helped a lot, I'm just looking to see if there is another simple fix.
I suspect that the majority of 4Runners never see off road use, but their owners have other reasons to own a 4wd. I used it yesterday to back a trailer up a gravel driveway which I could not have done with a 2wd.
Everyone has different needs. I buy what works for me and what I can afford. A new Suburban may have been a better fit but the $20,000 difference in price was not.

If someone feels the need to modify the suspension or up their tire size do you recommend they buy a Humvee?