This info has been very helpful.
Have you guys found that TRAC is capable enough in 2wd? I've come from SUVs with limited slip in the rear axles (Chevy Tahoe) and they were pretty capable in 2wd. In just average snow/slick conditions is there a big difference? I know tires are an important consideration, and I've also done some searching on the site, but opinions vary.
In the Allegheny Mountains of WV, I generally drive in 2WD with the traction control ON all the time. Rain, snow, etc. 2WD. When I'm seeing the traction control light coming on a ton, I move over to 4WD. I'm still in the regular traction control. I've not needed to turn off traction control to spin myself out of anything at this point. The truck is very capable in just 2WD and 4H.
I do like leaving it in 2WD, turning the TRAC and VSC off, and doing a little dorifto in the parking lot when we get a light snow fall. But I'm also a child in a 31 year old body. So, there's that.
Just for clarity, I figure I'll post all the different modes for the part time 4WD systems. Most of these apply to the Limited, too. (on the limited, what I'm calling H2 in the SR5 is H4 in the Limited, H4 on the SR5 is equivalent to H4L in the Limited.)
H2 Trac ON VSC ON (normal driving)
H2 Trac OFF VSC ON (press and release traction control button)
H2 Trac OFF VSC OFF (press and hold traction control button for 3 seconds)
H4 Trac ON VSC ON (shifted into H4)
H4 Trac OFF VSC ON (shifted into H4, press and release traction control button)
H4 Trac OFF VSC OFF (shifted into H4, press and hold traction control button for 3 seconds)
L4 Trac OFF VSC OFF ATRAC OFF (shifted into L4, Trac and VSC automatically turned off)
L4 Trac OFF VSC OFF ATRAC ON (shifted into L4, Trac and VSC automatically turned off, pressed ATRAC button)