I have been using a pneumatic tail wheel for about 10 years now, and supplying the little 6 x 1.25" wheels for nearly as long, but a recent inquiry by an RV flyer prompted me to look at the possibility of something a bit heavier duty. It turns out that there are people even more adventurous than those who fly homemade aircraft and that one of their activities is riding off-road electric skateboards. Some of these contraptions use 6 x 2" wheels which happen to be a handy size for an aircraft tail wheel. Here's the trial wheel fitted to my Sonex.
I am presently trying this out to check tyre life.
Peter