Chevrolet 4.8 vs 6.0

I’ve been looking for a express cargo 155" with passenger side barn doors. I see lots of 135" and mostly v6 4.3. How are the 4.8 v8 motors? I’ve really been looking for a 6.0. I will be doing some towing with it. Can you tow in a mountainous area with a 4.8? Or will I be struggling and overheating trying to go up hill with the smaller motor? And I believe that the 4.8 and the 6.0 get almost the same MPG.