My friend owns a tow company and runs them on his trucks all the time due to the cost. When I needed six new 22.5s last year (ouch) I bought the Sampsons.
My $0.2. I am not worried about durability since he runs them hundreds of thousands of miles. The first thing I noticed though is they tend to wander at speed down the highway, even after they have some miles on them, compared to the Michelins that were on there. I would think twice about putting them on the front next time around. it is not a dangerous wander, just more noticable.
I would consider putting them on the rear 4, and running Michelins or something else up front to help defer the overall cost. Personally, I am not worried about rotating front to rear because I will never accumulate the miles to wear them down before the DOT dates are too old and I would replace them anyway. We probably only accumulate about 3000 miles per year on the pusher.