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Actually my in-laws can do a lot with their shifting weight.
Seriously tho ... your factory shocks are built to handle 22s as they are an accessory option for autoride and non autoride trucks alike. Having run 22s with your exact tire dimensions and with the truck full of people ride quality was surprisingly close to stock. Plus my in-law analogy is a poor one anyway as there's a difference between shlepping extra weight and simply dropping the truck without added weight.
Anyhoot, I hope the heater hose solution solves the issue for you ... although on its face it seems more of a treating the symptom than curing the disease sort of approach.
neither you and i know or care to do the research to figure out whether in fact the hybrid strut/springs share the same part numbers as those that are not whether running 18s or 22s. thinking it thru espn style here, pls correct me if i'm wrong ,but i believe the only other gm hybrid suv that doesn't have autoride like the tahoe is the yukon and they 2come with 18s stock. both the denali and escalade hybrids come with 22s w/ autoride. so how do you suppose the stock hybrid tahoe shocks are built to handle 22s? did hillybilly PM you?