That really doesn't look too bad, and it's a pretty good discount over what I'd expect the value of this camper to be. Probably want to make sure there isn't any damage to the water heater since it's on the side of the camper that was damaged.
As a side note, I like the bumper/step setup on the newer Bigfoots compared to my 1999 that has the old 5-step telescoping stairs. I may need to look into the feasibility of retrofitting mine with the new stuff.