You are very right there, I am a Generator Dealer.
With ref to the nicking, I had worse three years ago at tetre rouge some pr**k put sugar in the fuel tank, I thought most of us were understanding. We fixed it though and it was a hire one! Wouldn't have wanted to pay for that when I got home.
I only use the genny to get the fridges down to temp then switch it off.
Anyhow enjoy.