No problems on my install. However, as where you come through the firewall (at least on my Liberty) was awfully close to the brake lines, I would suggest using a drill stop collar:
so when you punch through the firewall, you dont punch through the brake lines.
Also have a spotter. It will make your job easier.
Also, like cpd520, I had to go a little off center to find a spot to get through
One beautiful wife -Trooper and Doc the furcampers
2019 Dodge 4500 Flatbed with 2013 Chalet TS116 http://www.brittanynews.us