Tundra pre buy recomendations - towing centric

I'm looking for experience/recommendation as I search out a new tow vehicle. I'm currently in a 09 TBSS (LS2/4l70e, air suspension) with 6K towing limit. My routes are pretty flat with elevation ranges <1000Ft. About 50/50 expressway/secondary roads. I tow two trailers, a 19ft boat (3K# single axle), and a 16ft aluminum open car trailer (5500# dual axle).

The TBSS tows both great, however frame rust is getting the best of it (smart putting AC drain over opening in frame) commencing the hunt for replacement.

I considering a 19-22 tundra crewcab short bed with 5.7, prefer limited package. I'm old school, no replacement for displacement simplicity. I realized it's best to add a trans cooler. WDH is not in the cards.

My conditions well within Tundra practical comfort?
Anything I should be looking for or to avoid?

I'm using a stand alone brake controller. The boat is a electric over hydraulic, the car trailer all electric brakes. Does a built in controller cover the electric over hydraulic unit?

Tow mirrors a necessity?
Given the tongue weights, helper leafs or airbags required?

What else is recommended?

 

I'll start since no one else has yet.
If you want a V8 your search will stop at 2021. These are great trucks for towing, I tow an enclosed car trailer heavier than yours with no trouble. I use both a WD hitch and air bags but honestly I don't need both, either would be sufficient. My truck is earlier than 2019 and has the trans cooler. if it didn't have it, I would probably add it. The trucks come with a factory brake controller, I wasn't happy with it's performance and went with an aftermarket which works great. I use tow mirrors when I tow the enclosed trailer, it's necessary. I put the stock mirrors back on when I'm not towing it (I know, seems like a waste of time). I also have an open car trailer and don't need the tow mirrors for that. I don't think you'd be disappointed.

 

NT, thanks for the info.
From my research, I'm confident the tundra will be fine for my use. If I unload the TBSS before a tundra is purchased, I'll keep the controller.
After a bunch of reading it appears I'll have to pick up aftermarket rear suspension aid, likely roadmaster as I had air bags in the past, too much diddling.
Otherwise, provided I purchase one that's not a bag of somebody else's problems, I should be set to go.

 

I tow a 19’ boat on a single axle trailer. 140 outboard with 9.9 kicker. 92” beam, 72” bottom. Total weight is 4k ish. Don’t need towing mirrors. I do use tow/haul always. If on a winding road, or varying speeds, or going up hill, I have to use S4 to keep tranny temps inline. So far not adding a cooler, but am going test the tranny fluid again in another 30k before deciding for sure. Look for a 16-18 if you want the better factory cooler. Also make sure and get the larger gas tank.