The Logging was no doubt to to overstress on the tailboom. There have been more than one of those. Slinging a load of logs with a huey was not its designed intent and the tails have been breaking off due to structural fatigue. There is a mod out for this exact situation.
Agricltural OPs?? In the states. Im sure this translates to Fire Fighting as the Forest Service in the States is under the Department of Agriculture. Quick turnarounds and Heavy loads, make for high torque and stress.
None of these problems should arise by hauling pax. Heavy slingloads would be the problem.