Alcoa wheels are expensive and have a high rating by comparison. They need sticky weights inside the wheel because the regular weights will cause a white rash to form on the coating with the outer edge hammer on weights. You also need to scrape the mating surfaces anytime you have the wheels off because there is always a bit of scale from the corrosion being that its against a steel hub all the time. This so you can torque them to at least 120 ft lbs. Mine are not hub centric just well torqued with a good torque wrench. been hauling the camper with them for 16 yrs this October. They are the highest rated 16 inch rim you can find.
I don't want 19.5's because I think they are too hard on the running gear with 3.55 gears. Maybe alright with 4.10 running gears