2007 freightliner Columbia

Kudos on your first truck. Given the date of your post, you've likely had the crack in your exhaust repaired. If not, do it soon, as it could leak harmful gases into your cab. The heat escaping from the exhaust could also impact your a/c performance as the bunk a/c lines run parallel with the exhaust. If you're planning to repair the exhaust yourself invest in an 1/2" drive cordless impact, 1/2" drive deep socket set and a metal mallet style hammer. They will improve your experience. I personally like the Milwaukee M18 Fuel Gen-2 18 volt. Lots of torque and I think it comes with a 2-year warranty. Be mindful of your business, know your numbers and read your contracts thoroughly. Safe travels and endless success!