Think the 3 liter will be underpowered? Those Yukon xl's and and suburbans are big vehicles. My mom has one with the 6.2 liter, and I wouldn't ever consider buying one with the 5.3 after riding in hers.
I think the 5.3 would be a dog in one of those, especially pulling a load
2018 GMC l5p ccsb stone blue metallic. Mcgaughy's 2" drop shackles. Truxedo tonneau cover. 20% tint. B&W turnover ball hitch. N Fab running boards, Duraflaps, Rhino lined bed
Traded:05 lly ccsb 205k miles, built trans and supporting mods
Traded:09 LMM CCLB Bone stock, fully loaded. 86xxx miles.