Anyone with experience towing with a Suburban

The most limiting factor for towing with your suburban will be the payload capacity. There is a sticker/label on the driver's door jamb that states "weight of passengers and cargo shall not exceed...". Tally your cargo and passenger weights. The remainder will be your allowable tongue weight.
Some folks like to fudge on this capacity rating, desiring to tow above that weight. Your decision will be how much fudge you feel is prudent above what the maker's engineers have decided, should you choose to go that route.