Thanks for all the good advice. I did not know the difference between the P tire and the ST. I may stick with the same wheel and just replace the tire. I have found a Toyo tire for about the same price as the P trailer tire:
I'm sure I can probably get some ordered locally, as the Toyo factory [one of them] is about 10 miles up the road in White, GA
The only reason I was suggesting bigger, is that there were very few tire choices in that size. I'm really happy with the wheel size [I one can be happy with that :-) } -- but I do think the Toyo's are a good option.