I used to own quite a few vacuum cleaner sounding Buicks years ago. 231 cubic inches was great for a 3,500 pound car. Using even less displacement to move near twice the weight goes against the thinking of my formative years. ...
I have an 87 Grand National & love it. Turbos & high boost are fine for 15-30 seconds at a time.
But exhaust manifolds will literally glow red-hot under long duration, high load.
I have no confidence that a tiny turbo gas engine can move a 6000+ lb SUV up a 10 mile grade in 90ºF heat, and not cause a long term degradation of the engine & other underhood comoponents
The classic chevy small blocks will run 300K+ miles with just routine oil changes and minor tuneups. My '94 350 TBI with 250K miles has never even had a valve cover removed, and maybe burns 1 qt oil in 3000-4000 miles.
I seriously doubt any of these tiny turbocharged "truck" engines -- if you can call them that -- will last that long.