BIG honkin Silverado or F-250 - possibly diesel! Remember you don't just have to TOW a trailer, you have to STOP it too. The 25' can be handled with a 1/2 ton, but add a motorcycle or two to the bed of the truck and you'll be way over the safety factor. The Tundra is NOT a 3/4 ton truck. Some have described it here as a 5/8 ton.
I have the 25 FB SE Safari - and look what I'm using to pull it - 3/4 ton long bed quad cab silverado Diesel.
Going UP big hills tests your engines power going back down with brakes that start to smoke will make you wish you had on Depends!
In the case of tow vehicles MORE is more! Safe is Better.
Happy Trails, Paula