My 882 spare is mounted on the side of the trailer. I too would like an under the bow mount, as I'm not able to see my right side tire in my sideview mirror while trailering.
My spare tire is mounted on my post for the winch, can see both sides of the trailer when backing. Only issue is when I drive or back into a severe dip, the cover may scuff on the road a little, easily solved by raising it up a little.