I would suggest if you are going to stick with a SUV you have the following options available on the configuration and be looking at towing up to a ROO19 size trailer with the slab front:
Factory tow package including the extra transmission cooler
AWD vv 4 wheel drive as a minimum
A manual shift ride override/selector on your gearbox to manage the transmission and shift process when in hilly country
Load sharing stabilizer hitch
To cut down wind effect a wind deflector such as in RV Fuel Savings Guide
This also stops snow accumulation on the front slab and picking up bugs.
I had a Hyundai Santa Fe configuration and this coped most things OK and regularly crossed the Appalachians in the winter until I moved up to a 5th wheel and a fully configured F150 with a 11K tow capacity. If you want to do serious towing a truck is the only way and I get the same gas mileage as I did with the SUV pulling over 2+ X the weight.