Which part do you think has been modified? I don't see it (although could be missing something), although I see a couple of possible optical illusions, I think, and maybe one flaw.
It looks as though there is some sort of exterior cord (propane line?) running along the driver's side where the ridge between the red and the dark colors are. And maybe a body flaw or a vent dent? It also looks as though the roof is white and the body red, so there's a line there - maybe made with awning
rail or something (would probably be hot with the roof red).
Looks like a 1300 to me; I wonder what the bathroom looks like? Stock bathroom model or modded bunk/couch area? How can they not post photos of the inside?