You've got a longer wheelbase, poor weight balance for traction, and undriven axles. A mixer would make it, wouldn't need much of a road smoothed out. They go crazy places and get stuck all the time, farmer/hippie bridges are the worst. If they get stuck, all they care about is being able to transfer the load to a second truck, and get pulled out by something, eventually. Collapse a bridge, even a small one, it ruins your morning. I haven't thought of a way to do ICF with the mass open to the inside. I suspect most solar people are too individualistic to use a product like THAT anyway you and me both Spud. Check your private messages.