I have kenda bearclaws htr 26x11R12 on all 4 on 5-2 offset wheels and 1 inch spacers on the rear to even the tracking out. They are a really good tire and when I wear them out I will be going back with them
I run the Kenda Bearclaws HTR in 26x9xR12 fronts and 26x11xR12 rears. They are a great tire for the money and do snow mud dirt very well. I can't compare them with the bighorn 2.0 as I have only had the stock tires and these. I'm sure the Bighorns are a fine tire as they have a big fanbase but my 2 cents is the Kenda HTRs are a solid option for you p500.
When she was still fairly new and plain, but with the bighorn 2's on 5-2 wheels. They have been a great tire so far. Around 550 miles on them with pretty much zero wear.