I'm confused - Suburban 1500 tow up to 7,500 lbs?

Does me saying we are leaning towards the Clipper sized trailers (GVWR 3,500 lbs) change the conversation at all? That is half the tow capacity of the 1500 Burb. I understand there is more than just factors than just "will it pull". So with using half capacity, is that manageable for all aspects of the tow (engine, brakes, frame, etc.)? I have nothing against 2500s, just not as many. They are either beat up trucks or high mileage in my price range.