[twindman]

I live in Mesa - pretty much the same temps as Yuma. In full sun and with no awnings, I don't think it will be good. But remember reading a thread about keeping Monty cool and they said the biggest difference maker was slide toppers. I would agree, as my cupboards in the slides are quite warm, so keeping the sun off would make a difference. And if you don't have dual pane windows, probably the bubble stuff would help. I don't quite remember, but have stayed in Vegas overnight and El Paso, and I think with A/C running all the time it will stay near 80, so am guessing with the mods listed, it is doable.