Here at BWD Equine Services this is one of our most frequently asked questions!
There are a few things to consider here
Has your horse worn wraps before?
There is no point in putting something on them that is unfamiliar. Trailering can be a stressful event for horses without adding another unfamiliar element. If the horse panics because they are not used to wearing wraps, you can end up with a very preventable injury.
Do they fit? Can you put them on properly?
This is also important. Putting wraps on poorly or that are ill fitted can create other issues while shipping. The last thing you want is for your horse to get their wraps partially off while shipping. It is not safe for handlers to climb into single stalls under horses to unwrap a poorly wrapped horse. This situation can cause injuries to both the horse and the handler. If they don't fit, or you can't put them on properly, you are better leave your horse unwrapped.
Is your horse travelling alone or with company?
If your horse is on a trailer with other (usually unfamiliar) horses in standing stalls that are open at the bottom you should definitely consider wrapping your horse. There is no way to know if the horse travelling beside yours travels well and they could easily scramble or kick out under the dividers. Best practice is to make sure that your horse travels with ample space to avoid this situation.