I just switched to SunF 26's radials all the way around. Checked tread contact with the chalk method. Started out at 10psi and dropped 1/2 pound 3 times until I got a good wear pattern at 8.5psi. It could stand to drop to 8psi without consequences. Rides and drives 100% better.
What I did discover is that the rear axles apparently are spooled, i.e. locked, resulting in a locked rear end full time. Perhaps that's good for most people, but that's the cheap way to go - IMHO only. Something more of a posi-track type differential, allowing the inside tire on turns to not be forced to scrub all the way through turns. That will also result in some broken rear axles when making tight turns on hard surface.
Going the 'posi-traction' or 'sure grip' way would be a little more costly, and would certainly be the preferred way. That info, of course, is never shared with prospective buyers. But at a small higher cost.