Hi, if you are still a look out for a winch for an enclosed trailer. I suggest you to read readthis article so you can choose which one is the best for your needs.
IMO buying a winch is like buying a trailer. Buy the biggest and best you can afford. Yes small ATV winches will work but IMO if you can afford a larger one buy it.
"I am not ashamed to confess I am ignorant of what I do not know."