My Yamaha owners manual recommends 22 PSI, I keep the tires close to that, ours has 4 passenger capability (aka a fold down rear facing seat). As for replacements, there are many options, several (maybe all) of the home service golf cart repair companies can replace tires at your house. If you can remove the wheels (with tires), then there are several tire com[panies (like Wildwood tire) that carry golf cart tires and can mount these.
Yes I would rotate the tires.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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