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As a previous V6 owner. There wasn’t a V6 LS(though that would have been awesome). It was a great engine, but it couldn’t tow anything. Made decent low end torque, hated a trailer, I also had the 5spd and never got better than 16mpg. I’d get the Tahoe, do an exhaust, high flow air filter, maybe a black bear tune.
Heck. If you want reliability, decent power and gas mileage. Swap in a 1uz-fe like my Lexus has. Or a 2 or 3uz-fe. All are V8’s. Otherwise just leave the 350.