Yup, and U-Haul runs the little suckers by the thousands. I have the so called bad tires on my two flatbed trailers, 235/80R16 load range E made in China or Bulgaria or somewhere and seem to have good luck. However if/when I have a blowout nothing is damaged.
I would love to have a set of 17. 5 commercial 16 ply tires and 8,000 lb axles on my new goose neck for some extra margin. With the 7,000 lb axles and the tires above I am always at my max capacity.
Like you said at 8,200 GVW the 5200 axles and tires should be fine. With the standard 6 bolt wheel pattern, if and when you want to up grade, any Chevy wheel will work, they are laying around by the thousands.
Nick