Overkill?

I will be moving from NH to CO early August, towing a large enclosed trailer. Im looking to upgrade and improve the taco a little bit before i make the 3000k route west. I'm new to the suspension/lift game so some input would be nice.

The truck is an 06 sr5 with 108k miles, 4x4 double cab with short bed. The move across country has become an excuse to beef up the suspension, add 2.5"/3" lift, throw on some new shoes, and a cat back borla exhaust.

Anyways, I considered an AAL pack, and 5100's all the way around and a readyllift SST kit. Possibly a air-bag system too?
I feel it is worth noting that my leafs are sagging a little bit from age. I must admit i am little overwhelmed by the options available, combined with my inexperience with anything suspension related. Would upgrading with all of this be overkill for someone who doesn't do much off-roading?

My last question is about cooling, I've looked into aftermarket cooling fans, and was curious to see if anyone has used them and would recommend purchasing one.

I appreciate any input guys.