Nice truck. I love my 19. Their tranny’s will tend to run hot. They have a small warming and cooling puck, not a dedicated cooler. If you plan to keep it for a long time, I might monitor it and see. Some run cooler than others. A veepeak OBD scanner with the OBD Fusion app & adding the extra Toyota codes will do it.
My tranny temp would get over 230 degrees at 70 mph on a level freeway no head wind in warm weather, just driving, lightly loaded and not towing. I could not use 4 hi off-road in warm weather for much more than 5 minutes, then too hot. I added a cooler and alls well. If I towed my drift boat, it had to be in S4 with tow/haul enabled or it would get real hot. Even then it ran at 210-222 degrees.
Toyota says it’s fine. Every tranny guy I talked to said it is not. Now with a dedicated tranny cooler I can tow in D with tow haul selected, run cool (under 195), run at lower rpm’s and get better mileage vs the factory set up. At a minimum, I’d change the tranny fluid now, and do a drain and fill about every 30k if I towed at all or did freeways driving in hot weather.
You are low mileage enough to add an extended warrantee if you wish. They are prone to cam tower leaks, they usually show before 100k. Some guys fix it, some don’t. Tundras.com has a wealth of info, if you are not already a member it’s worth a look. They have guys there that sell extended Toyota Motor warrantees for much less than most dealers. You can probably sell your rack there too.