OH ok then...
I'd definitely go with the 4.11 for sure. She's going to have a lot more confidence in the ride if it "seems" powerful and gets her there "easier". Yea, that might cost you some mileage for around the town in the mean time, but overall, I think She'll be more satisfied.

 

PS, I just thought to mention a couple more things...

You need to check your GTW (gross towing weight) and make sure your rig doesn't exceed the OEM poundage. It doesn't matter how many addon's you stack on that thing, IF you/she is pulled over for a weigh, they'll go by the original capacity.

On the Tires...
Make sure that the Load Rating for a/each tire, is at or near 50% of your vehicle max/loaded weight. (that's 1/2 the weight of the vehicle + 500 lbs) (assuming you have a 1/2 ton Hoe)

And, don't be afraid to air them up, at or near the "Maximum Cold Inflation Pressure" as listed on the side wall of the Tire. That'll give you a LOT better performance and stability, and ALL tires are rated by their Manufacturer to be operated at those higher pressures for the tire's Life.

 

I've got an 07 Tahoe with the 3.73 gears, to be honest if I was going to tow something heavy I would still jump up to the 4.11's. But that is my opinion and I have another vehicle that the family can get around in that gets about 27 mpg, your situation may vary.

 

I have anouther small SUV we get around town in too. I think an 07 tahoe has the 4speed tranny, so 3.73 should have a more dramatic effect since I have a wider gear range in my tranny, I think. I do wish the around town family SUV got 27 mpg though, but around here Prius barely get that. I had a 4 cylinder Camry once that only got 17.

 

I'll be driving, my daughter is a bit small to drive yet. But She and I will be showing the horse.

Just for fun, I went and drove a Serria with a tow package and 3.42. It had a little more, but not much. They don't make the 5.3 with 3.73 any more I guess. To get the 3.73, you have to have the 6.2.