5th gen runner vs new grand cherokee
Considering purchasing a 2014 Jeep Grand Cherokee
The above links take you to about 20 pages of reading on your subject.
Bottom line, either vehicle would do just fine for you.
The JGC has tremendous reliability issues compared to the 4Runner as you will read in those links.
Tow rating has nothing to do with uni body or frame. Brakes, transmission, engine, gearing and structural strength do.
The 3rd row will fit very small humans.
Yes, we all ride with the rear window down.
Only you can judge all the bells and whistles offered and determine what you need. Most everyone here bought the 4Runner for reliability and durability, not to mention the retention value of 80% vs 58% for the JGC. That data can be found here:
5th Gen Price Retention
So, read a bunch and good luck.