Just about to order new tires for the trailer. The spec sheet says 6.5" rims, I have 6". The tire size is the same as the tires I am replacing ST235/80-16s. Any issues?
If you're selling later and only want to pass inspection maybe you could look into used tires.
From the threads I read here, many are taking off good ST's they're afraid of to mount LT's. There have to be some good ST take-offs out there to be had at bargain prices.
I've bought used before when I only needed one and knew I'd get another year out of the others (trailers and vehicles). Never had a problem.