A trailer as a 'bug-out' vehicle? It depends. If hard times (however you define them) arrive, you probably have determined whether you're going to shelter in place or go somewhere else. If you're planning on sheltering in place (which is my approach) you wouldn't be bugging out, so why waste time and money preparing for something you're not going to do?
If you are planning on bugging out, I'd hope you have a bug-out place in mind and it's not going to be much more than a tank of gas away from where you are. That being the case, I'd think you'd want something a little less noticeable and a bit more nimble to get you from Point A to Point B. A high-ground-clearance vehicle able to carry you and your family and enough stuff for a day or two would probably be enough.
if you don't have a place to go to, you're not bugging out, you're a refugee.
Admission: I moved to a rural location so that we could shelter in place, and have no 'prepper-type' reason for a trailer. But I do have a trailer, a Lance 1575, which is for going on long-weekend or maybe a week's worth vacation if we can find someone to take of the chickens. But that's not prepping, it's just fun and relaxation.