My wife and I are thinking about swapping her 2013 GMC Acadia for an 07 Yukon XL Denali.

It's got 133k miles and we can swap for no money out of pocket.

Does that seem reasonable?

Is there anything I need to be weary of on these vehicles or any known problems?

I'm taking it to a mechanic for review before purchase

Also fwiw I know the previous owner of the Denali which gives me some peace of mind.

Airbag suspension will fail. Transmission is iffy.
Engine is solid.

Certainly more reliable than the Acadia.

Should have a 6.2 which won't have AFM lifter issues. Being a 6.2, it'll have six speed trans which is much better than 4L60e.

Make sure the AC works. Seems GM can't manufacture one that doesn't break

Decided against it after reviewing the car

All things being equal it would be hard for me to get a car 6 years older than the one I already have.