I think the seat will be fine, all other concerns are valid.Should I have any other concerns? Will they break the step, dent the wing, crush the seat?
There comes a time to just say "NO" to a passenger. That time for my RV9 is 250lb (sometimes less), depending on the passenger's physical health. I get very concerned if a person cannot physically ingress or egress the cockpit easily. Secondly, I am not interested in having to repair steps, canopies, or other aircraft parts that may be over stressed by a large person.
…..Control movement was limited laterally by his thigh girth even with the seat fully back……
I checked may weight and balance. The gross weight and CG is easily within limits with me and a 330 pound passenger in the front seats. Should I have any other concerns? Will they break the step, dent the wing, crush the seat?