The Dreaded 1/2 Ton Towing Question

I pull 6,200lb TT with empty tanks. Never travel with full holding tanks. We have a 04 Suburban with the 5.3 liter and 3.73 rear end. The only problem since 04 has been pulling steep grades and caving in to the dog to turn the air back on. I do have to pull some grades in low and limit my rpm's while holding up some natives trying to reach the summit in record time. Sorry but they live in a tourist area with RV's all over the place and should expect at times to slow down. The TT is a 28ft Springdale which follows the Suburban perfectly never fish tails or fails to respond to the brake controller. High winds are a problem but we just pull off have a snack and wait it out or camp for the night. Another concern are steep down hill grades with run away ramps and DOT warnings at the rest stop before going down. This is something to consider when pulling a heavy RV also and light trucks might not do the job. I have seen semi's burning brakes and wondered if I will soon get into the same situation, experience is important here as well as information from truckers or other campers about the grade you are about to attempt with your rig. The new GM 5.3 liter engines with 355hp should be perfect for towing but I have not heard, mine is only 290hp mated to a four speed trans. Newer trucks are using newer transmissions with six speeds or more. Not sure how that plays out. I did have a conversation with a insurance guy camping, he said stick with engines with less turbo charging and complicated hp boosting gagets it can be very expensive to have repaired or rebuilt and they build this into their costs. He
was towing with a Sierra Pickup. Hope this helps.