Photoengineer...another problem you have to deal with is the expectations of the state or federal regulators.
Back in the early 1990's I developed the initial inspection protocol for amusement rides and devices for the state of Florida. They then required certification of amusement ride and device inspectors. I was one of the first 10 authorized to do that. Then the protocol had to mesh with state law...that's where the problem came in. Someone in the legislature, with some poor engineering input, decided that each amusement ride had to be "tested or inspected for fatigue". I explained that there was no visual, predictive test for fatigue and that only stress levels and stress repetitions with respect to materials could predict that and not even reliably so. Deaf ears.
Bottom line...I did some of the transportable rides inspections but decided that the liability was too high for that and confined my inspections to the "permanent parks" rides at Disney, Universal and Busch parks, which I did for about 10 years.
Have done failure investigations on a variety rides, both the transportable type and at permanent parks.