p-1000-5 wheel and tires

Hi, My new Honda P 1000-5 came with Black Stone tires. I just put in 100 miles. Not sure they if they are radial tires and or what ply ? Worry about reliability? Wondering if I can upgrade all 4 wheels and tires W/ SIZE 27-11x12 on my Honda 1000-5? Atleast 8 ply tires. We going Elk Hunt at...