Ditto, ditto, ditto!
If you're pulling short distances locally, you can get away with a 1/2 ton truck if it has a *real* tow package, complete with transmission oil cooler, beefed up radiator and suspension (Dealers sometimes call putting a box mount and an electric hook up on the back a tow package - it's not.)
For anything other than short local hauls, I prefer a 3/4 ton truck.
Not only will you wreck the Ranger in a very short matter of time; it's dangerous - remember, pulling is easy, stopping is hard. The Ranger won't have the stopping power to safely bring a loaded horse trailer to a halt.