When researching tow vehices I looked at the new suburbans and the problem was they have lowered tow ratings for the half ton models. You have to order the 2500 series to get higher ratings. I wanted a 10k rating and the Ford f150 set up as ours alongside the chev 1500
hd max gave that figure. It also gives a smooth ride and easy on the AS.Our 28 safari weighs 5700lbs dry. We are very happy with our decision but you might be pushing it with your AS, as I remember the half ton suburbans were maxed at about 8k tow rating. But then again our friends in Canada are towing 34 classics with hemi powered 300 chryslers. So, what do I know???