Nice AT4 you now have.
We did similar after being in a smaller SUV. The C1xx is just a bit bigger than the 1st Gen Terrain I believe by about 6" longer and 2 inches wider, but has much more interior room. Cargo room especially is huge with the 3rd row seat down if yours has one. I know AT4 (All Terrain) did not have 3rd row and then later was an option. In fact, one member here registered because he bought a 2017 All Terrain and it didn't have 3rd row seating.
Anyway. . . Happy Motoring !