In the interested of brevity, I'm not going to go back to the beginnings of horse trailers, just touch on the ones that I have personally hauled horses in...in my lifetime. My very first horse trailer was a teeny-tiny little one horse...
I actually think this one is bigger and nicer than the one I had. Oh yea, and mine was a single axle. Actually getting horses into these things is the trick. It takes some training! I don't ever see myself going back to using one. But hey, 22 years ago I thought I was pretty cool heading out to college with my horse, my dog and my cat.
My step-mom came with one of these...
A living quarters two horse. Pretty fancy stuff back then. They are heavy as hell, but pull pretty nice.
I've never owned an inline, but one of the trainers I worked for had a two horse inline like this...
The "show" trailer was LQ, 4-horse straight load...think double two horse. It was also heavy as hell, but darn, those horses hauled in it nice.
All my life we have owned some sort of stock trailer and that is what we primarily haul our horses in...
My current "using" trailer was a simple stock trailer. My brother was the one who had the tack room built on it. That certainly made it more usuable for going to rodeos and horse shows.
What most people are familiar with these days for hauling horses is the slant load...
Most slants are made so that the horse faces the left side of the trailer. However, reverse loads are also available...
Now here is a bit of trivia...hauling horses long distances in slant loads is harder on them than hauling them in stock trailers, irregardless of whether they are tied or loose. If you have ever noticed, horses that are hauled loose in trailers have a tendency to stand either straight forward or straight backward. It's easier for them to balance that way. They also have the ability to spread their feet out or move them easily it they need to catch themselves. Being able to use their whole body to balance is much easier on their muscles and legs than being confined by partitions.
So why have slant loads become so popular? Well, for a couple of reasons...You can haul more horses in less space and they are much easier to load horses into than smaller trailers. Nearly any horse can be convinced to jump into a big cave. It takes real training to train horses to get into narrow caves. So slant loads became the upgrade of the stock trailer. A way to easily load horses and yet keep them seperate.
Now that I am the owner of a slant load...my hauling tactics are going to have to change a bit when I haul horses in it. After hauling horses in a stock-type trailer for so long, I have gotten spoiled. In a stock-type trailer, I don't have to unload and hand walk horses every 300 miles. I could simply stop for about 30 minutes or so and give them a break from the road vibrations. In my stock trailer, I never ever had a horse get sore after a long haul. In the LQ we just bought, I am going to have to be more careful. The nice thing is, I can remove the partitions and haul them loose or tied backwards if I want.
Primarily, I do tie my horses in the trailer. I load, turn them around and tie them so they can stand backwards. They all seem to haul really well like that and there is just enough restraint with them being tied that they cannot get to moving around enough to cause the trailer to start swinging. This trip back to Colorado, I will have to haul loose, with Beretta not being trained to tie I don't have a choice. Strawberry will be a good influence on the babies though. He has logged thousands of miles in a trailer and is a good hauler.
I know not everyone hauls horses as far or as often as I do, anything under 150 miles isn't going to bother a horse irregardless of what type of trailer they are in...unless you drive like a jerk and are throwing them all over...which I'm pretty darn sure no one does with their's.
As for a horse getting injured being hauled loose. I'm not sure how they would, unless the driver is bouncing them off the walls. I've heard people comment about fearing rocks could fly into a stock trailer and injure a horse...ummmm...after hauling hundreds of horses, thousands of miles, on the highway and up and down gravel roads...that has never happened. Now...for you people who let their horses hang their heads out the window while you are going down the road...do you really think that those flimsy fly masks are going to protect a horse from a flying rock? That is way more dangerous for the horse.
If you ever get a chance, jump in a horse trailer and have someone drive you around. It sure gives a person a better perspective on what the horse is feeling.
I'm not a slant-load hater. They sure are nice when you need to keep horses seperate, but for the most part, I will always prefer hauling horses without the benefit of partitions. It is just so much easier on them over long distances.