this brings up a question in my mind .....how much strain can one put on the bow roller .....or should one always use a bridle and hook to the bow cleats.....
that would depend on the quality of the bow roller and the quality of its mounting. properly sized and done right, you would be able to safely lift the boat and shake it around with it. but.... some would say the roller is only to be used for deploying and retrieving, and that a bridal and chain hook or prusik hitch bridal (for rope rode) be used to take the load to a large center mounted cleat or sampson post, and always used with chafing gear...
the prevailing or expected conditions would dictate the need for taking one of the possible chances of failure out of the system, but almost ALL day sailers and weekenders will be fine using the bow roller. and in most cases, all small to medium sized pleasure boats everywhere, would be fine with just the bow roller alone...
PATECO, you may want to consider an anchor style that has a pointed entry (many different models available), as they will work over a broader range of bottoms.
the anchor yo uhave is great for its intended use but unless you know what the bottom conditions are, its not as a dependable of anchor as I would want holding my boat.
if you already have danforth anchors for the soft bottoms (which are much lighter and better), I would very strongly consider an anchor that is more versatile as your heavy bower anchor..