A point to remember when changing sizes from a designated ST235/80R16 to a designated ST235/85R16 is such a change is considered going to a "plus sized" tire. The tire inflation pressures and tire designated size will be invalid on trailer's certification label, in it's owner manual and on all other tire load placards.
Unless Keystone offered the "85s" as an option it's very doubtful they would approve the "85s" and tire safety wise the consumer would be out on their own limb - so to speak.
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