For treating Red Wing Hawthorne Iron Rangers, would the LP be a better alternative to mink oil? http://www.youtube.com/watch?v=3rxySqCA9ic#t=2m17s
In my experience, yes. Although I haven't used mink oil since the early 70's when I would bake my boots in the oven with it.
It will help. Picked up my 9011 (Black Cherry Beckman's) last week. Once they are broken in I will use paste wax on mine for a more dressy look. If I was staying with a work boot look I would use HDLP. Road salt is usually a mixture of chemicals that can eat though unprotected steel if not removed. No matter what you use if you walk through salty slush I would rinse them with fresh water as soon as you can and retreat. You can use the Obenauf's leather oil for touch up between coats of HDLP if you want, it is a bit easier than applying the LP and heating it in.