Hi everyone, long time reader - first time to post. I just recently purchased a 2010 Sierra 1500 Crew Cab 4WD with the 6.2L/6 spd combo. I has around 450 miles on it so far. I am planning a trip at the end of the month that will entail towing a 7k lbs travel trailer. Two questions: 1. Will I be okay towing this so soon into the life of the engine/drivetrain? Realizing the manual says no towing within 1st 500 miles. 2. Is it a good idea to change the oil after the 500 mile break-in period to get rid of any metal from the break-in? Thanks for any thoughts and advice.