Woo New Nitro owner

Just bought my Nitro, an 07, with a strange set of options. So far I love it, always been a Dodge guy, owning previously, a PT Cruiser, and still own a heavy cutomized 1999 Neon R/T Turbo (about 310 WHP).

I can't really figure out which Nitro I got, because there are certain options that seem to fit both the SXT and the SLT.

For example:
3.7 L
Auto
NO Load N go, has 2 sided cover.
4X4
SLT fabric seats
Power inverters all over
It has non painted fenders.
etc

From what I have gathered, Load N Go is SLT only, and so is auto trans. How I have a Nitro with auto + no load n go is strange. Perhaps because it was a former rental, with 11k miles when i bought it, they got to customize options some more? With the non painted fenders I wonder is it an sxt with auto + a few other options added?

Also the only other SUV I have owned was a Hummer H1, I was wondering what is the max safe speed for Nitro in 4 wheel lockout? I know in the H1 it was 55 mph for 4x4 High.