Considering a 2017-2019 Yukon XL or a Suburban

[slupie]

You can't get a 2015-2020 with a 2spd transfer case unless you get the Denali trim on the yukons. The SLT and SLE trims came with a single speed T-Case. Only the 6.2 denali package had the 2speed T-Case. 100k mark is where you're going to need to start doing a lot of maintenance. Not horrible if you can do it yourself. Spark plugs, diff fluid changes, motor mounts, rear tail lights, AC condenser... I love my yukon, but at that mileage it will require maintenance work if it hasn't been done already.

If you ge the factory trailaring package with the trailer brake controller you get the 2 speed transfer case. Even Denalis and Premier came with single speed T-Case if it didn't have the optional trailering package.

Here is a suburban LT with 2 speed transfer case.

https://www.affinity-autosales.com/inventory/chevrolet/suburban/a2873/