When we looked at our Argosy, I broke one of the mini-blind holders when snapping the blind back in place. I told the seller immediately, which I think worked out well since he didn't charge us extra for the installing the replacement.
Just tell your neighbors that you are not comfortable with anyone else being around the trailer while you are improving it and ask them to keep their distance. If they don't get the hint, put your local Sherriff's office to work. You are paying tax dollars for a reason.