285/70/17 are a tight fit and rub a little on some Avalanches and none on others. The 295’s will add over 1/2″ of height and will definitely rub hard, not sure how much trimming you can or are willing to do…..
https://www.chevyavalanchefanclub.com/cafcna/index.php?threads/295-70-17s.116532/