One thing you should verify is if your vehicle has a built-in transmission cooler. That same drive train is in Siennas, Highlanders, and 4Runners. Talk to a parts department (or go there) and give them the VIN. For 2013 some of them had it standard and some did not. DO NOT talk to a sales person about this, they will run off the window sticker, which tells you nothing useful about the standard equipment.
The most important thing to protect your transmission is USE THE GEARSHIFT and don't hesitate to shift down and leave it there on an uphill (or downhill.) The worst thing for a transmission is to be shifting up and down. And if possible, avoid tough grades in hot weather.
You should also go downhill on a grade in the same gear (or lower) that you went up it, to avoid overheating brakes.
Definitely get the brake controller set up by a good shop, along with a weight distribution system and sway bar.