So, after all the research I figured the driver's side would be the difficult side so I did that first. No issues at all.
However, when I got to the passenger's side I've found that the bolt holes are covered by the frame rail near the front side. I jacked it up so the it was close to lifting the front tires off and I still can't slide the bolts through. If it's any help all but one of the bolts on this side had to have a little bit of persuasion to get through (hammer).
Anybody else run into anything like this? Any ideas, short of drilling new holes as I want that to be my last resort.