I've already got a winch on my atv, I just have a couple extras and I thought I might would use one. But I'm leaning towards the box, I saw some decent looking ones at lowes the other day. They're plastic, but my trailer is kept indoors and I won't be putting anything of much value in there anyway. You don't need much to hold some ratchet straps and a tarp.

Post up a link or two to what you're looking at. I need to do something with my equipment trailer and don't have a lot of room to work with.

This is the one I originally had in mind:
UWS A-Frame Trailer Toolbox - Aluminum - Low-Profile - 2.9 Cubic Feet UWS Toolbox UWS04530

But I'm partial to the UWS brand, as I have one of their low pro boxes on my truck. They have several different brands on that website. I couldn't find a picture of the one I saw at lowes on their website but it was just a plastic box. But at the same time I'm not really crazy about plastic toolboxes so I don't know.

I agree, the come a long is very useful. I have loaded several cars with them onto trailers. Get a big one with as much capacity and length of cable you can afford. Not expensive at harbor freight.

Not bad. The good thing about expanded metal on the bottom is that dirt will fall out. A couple of guys I ride with went with diamond plate aluminum boxes. I might have put one on my trailer too if it wasn't a tilt-bed. The tongue wouldn't tilt so good with weight on it.

If it is purely for ATV//UTV loading, then a winch is good. A box will provide storage too. I'd think about maybe something tall enough for extra gas cans, straps etc. But as far as a spare winch goes, they can really help in a pinch. If nothing else, get a heavy duty rated come-a-long in your box. I have used them to load cars with too.