The bolt-on winch looks a lot like a welded winch except that the rear plate is slightly larger to accommodate heavy-duty bolts. It works the exact same way as a welded winch in function. The main difference is that it is bolted to the rail rather than welded.
This sort of winch can be moved around if necessary. But there is a downside. Every position you might want to locate this winch requires drilling bolt holes.
b. Bolt-On Winch