Sorry to hear about your damage and glad you're OK personally.Ranger, I run them at 5.5bar (75psi ) as per email from Frankia.
A couple of observations about the tyre pressures. I make 5.5 bar to be 80 psi, which sounds very high. My previous single-axle Frankia with Continental tyres I ran at 4.75 bar on Continental's advice, and this one with tag-axle I run at 3.45 bar. What Frankia have you got?