From the picture you posted it looks like your trailer had 7.50x16 bias ply tires originally, likely they were 10 ply. So you should be using tires having at least that same rating on your axles, going with even higher load range tires is good advice. 14 ply tires were available, but likely would have been special order if it had those. It appears Calico is still in business, so you might call them and see if they can/will tell you what was on it when it left the factory to meet the rating.
235/80R16 load range E (10 ply) seems to be common on new trailers with 7K axles. That size appears to be a replacement for 7.50x16 as well.
One critical thing with trailer tires is to keep the tire pressure up to the spec pressure for load capacity shown on the side walls. I expect low air pressure is the leading cause of trailer tire failure. As the ply ratings get higher so do the required pressures, 100-110 psi is not uncommon in the higher ply tires.
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