Live in Denver areas most of my life but I am new to the diesel age. Just bought an 08 Silverado CC/SB 6.6L LTZ Z71. Excellent truck and from what Ive seen on this forum its one to keep for many a year. Looking to do some minor mods as far as tuning, exhaust, exterior and audio. Especially looking to improve gas mileage as I put about 350-400 miles per week on it for work and play. Also have a 27' travel trailer, so any improvements to help getting her over the hill a bit easier and efficiently would be nice. Any help from anyone would be awesome. Thanks