I just changed my Struts today. The top rod nut I held that big washer thingie with large channel locks and the impact spun them right off. The lower two were a pain. The impact gun didn't do anything with them. This is what got them, a 13/16" box wrench holding the bolt head. 15/16" 1/2 drive socket, 18" breaker bar and 3' section on 1' black iron pipe over the breaker bar on the nuts. Then it's fun compressing the strut, then holding it compessed with one hand while you put in the bottom bolts.
The first side was like 1 1/2 hours and then twenty minutes for the other.