Make sure you take someone who knows about horse trailers with you. I have experience with trailers, but I already told my dad he is coming when I buy my first trailer in a couple months. I helped redo floors and body work on trailers and can rewire an whole trailer by my self. I do most of our trailer repairs.
We used a bumper pull stock trailer. It's extra tall and extra heavy, a lot of trucks can't handle it plus 3 horses. We also do lots of camping trips, so the open space in side can turn into feed food, we can haul any size of horse, up to about 18 hands tall. It's a 4 horse trailer, but normally only haul 3 horses.
Now, since I'm 19, have my own truck and want to show more I'm getting a smaller trailer. My truck can't handle my Dad's trailer and really his truck can't either. I'm looking at getting me a straight load 2 horse bumper pull. This will be my first trailer, I'm an college student by need something I can haul easy if I ever need to haul more than 2 horses have my dad's trailer. My little truck can handle an two horse once I pull electric brakes on it, plus I can borrow a truck that can handle it better. The thing is since I'm very knowledge able in repairing trailers, plus have my dad their to help I'm getting something that needs fix up, if I can get it cheap. I'm willing to replace wires, and the floor. The frame is what I'm really looking at being in good shape. Also make sure I have a window that opens in the front and escape doors. I will be adding electric brakes to truck and trailer. I will be hauling two barrel horses or two trail horses.
With you not having no experience, I would make sure to take someone who knows about horse trailers, get the truck you will pull with first that to know your limits. Make sure all the light wires are good, the floor and frame. I will check tires too. I also agree getting one horse bigger than you need. Another good reason is you can always haul hay in the empty stall, instead of getting all gear covered in hay. You will find a way to tie it where it would move and your horse can't reach.
Extreme Trail Rider and Barrel Racer.
King - 11 year old Tennessee Walker Gelding
Sassie- 7 Year old Appaloosa Mare