Update:
Picked it up today and drove it back (about 60 miles total). I worried so much about the ride with the leaf springs....forget it. It may ride better than the 3/4. The tires were at about 72 all the way around. Aired down to 64 front and 60 rear to see what happens.
The 4.10, 6.4 and 8 speed are great for me. SO smooth compared to the 6 speed. 900 ft. lbs. of torque? Not happening but it is substantial and will definitely work for my needs. And the 4.10 vs 3.73 gas mileage? Ha! Looks like from the computer I get the same 30 mpg with the 4.10 vs the 3.73!
Seriously, at cruising speed I'm not sure I see a lot of difference noted by the EVIC numbers. Throwing the trailer on it will tell the tale but I'm not worried about a bit because I'm sure it will tow better and if there is a drop in mileage it's a moot point to me.
We've got to take puppy to specialists tomorrow so don't know if I will get some pics or not. The vet thinks she may have Cushing's disease so going to let the specialists tell us what we need to do.