I would agree the Ribs or 250's should be a good choice for his rig but it is a good idea to weigh ALL TIRES SEPARATELY ! Our MS for example weighs MUCH more on the drivers side. Example GY G's should be fine on our Mobile Suites and they did last 5 years with good tread wear and not even a flat but the drivers side rear tire weighs 3,840# nearly 100# over the G's max load rating,
Sure the G's are more money than brand X but for my money they are the best choice in that load range. In the E range I would be going with the Ribs of 250's.
As far as "that is why I have insurance" goes. If I had damages of $900 and my deductible was $500 I would not turn in the claim. So there is the $400 difference between the Sailun and GY G tires.
All of course JMHO!