The things that you need to consider are your GVW/tow rating, the gear ratio, your transmission and wheel base. Installing a trailer brake is going to help alleviate some of the stopping issues but you still need a big heavy vehicle to tow. I have a friend that hauls horses with her big Lexus and it makes me queasy.
Talk to a good, independent mechanic. Mine wouldn't let me buy anything less than a 3/4 ton, 4x4 with a tow package and heavy duty engine/tranny to tow a two horse, mostly aluminum trailer. And I still wouldn't haul in the mountains with it, but it's great for short (<8 hours) trips, even in bad weather.
They say money doesn't buy happiness -- well happiness doesn't buy horses!