I don't have one but can tell you when I needed one. Stopped overnight in a CG in northern Fl on way home last year. Forecast for rain / cold. Went to close roof vent and it fell off, big hole in roof. Late at night all neighbors sleeping. Did a search behind CG office ( closed ) and "borrowed" their ladder. Duct taped the vent. Now I have new vents AND vent covers! Still have no ladder with TT. Yes, I did return their ladder.