I use my '08 V8 Sport to tow my race car, 2900# car +1000# Trailex + 5-600#s of driver and gear.
The big hills around WGI and along I-88 can be a challenge even for the V8 the downhills more so than the ups, you just drive sanely. But you can also cruise at 80 on the flats, I avg 16.3mpg...