Real trucks don't need sway controls or weight distro hitches or any of that garbage. That's just a bunch of band-aids for little 1/2 ton trucks. The Tundra just isn't enough truck. Period. That Truck's a great truck for people that really don't haul anything at all. Maybe a 16' travel trailer or some jet ski's or something. No matter what the manufacturers rating says, 8000 pounds behind a Tundra is a white knuckle ride. There are no effective aftermarket kits to get these trucks to where I'd recommend them for 2 horses or more.
Just not enough spring or brake. Not even close. I know the Tundra's and F150's come overrated with 10,000 pound trailer ratings. Don't fall for that. There is no such thing as perfect lab conditions. One windy rainstorm has sent plenty of 150's flying through the air when thier ultralight 25' travel trailer, that was well within the GCVWR, caught a gust of wind.
(Do Tundra's even come with E rated 3300+pound 80 psi tires?)
Look at the pro's trucks. 1tons with regular factory hitches and pintle ball mounts. Maybe airbags added for extra stability. Proper trailer and truck setup negates the need for sway control, (which deosn't work anyways). I can get some pic's of my setup on my personal truck or work trucks if you want.
The True Control Gold is the best trailer brake controller I've used yet. I've had great luck towing with E rated GY SA's, BFG ATKO's, and Cooper M&S's.
I'll be sweating bullets towing 2 horses with my 1ton, and I passed a F350 SRW on the road pulling 3 horses in a tandem axle trailer a couple hours ago. That truck was sweating and squating. (I'm in Ashland Ohio, horse country)
The new 2012 6.2L gasoline F350's are very promising. I get about 16mpg with my 5.4L. I wouldn't bother looking at the glass tough diesels either unless you want to go all the way up to a heavy guzzler 450/550. 2005+ Ford Superduties are everwhere quite cheap. Get a gas one, rebuild the engine and transmission. Do the brakes yourself. And you have one monster of a truck for dirt cheap (compared to slightly used trucks with questionable engines, or the new $$$ trucks).