Hello Moisheh. It's good to see you are still active here. I have not been for years but I took a look today and have some input. We traveled about 15000 miles through Mexico in our BigFoot SL29. It's really 30 ft. and it was perfect for us with only an occasional desire to shrink. It is a fiberglass/foam construction - very well insulated against the heat - and has dual pane windows. They are not widely available since going out of production during the financial crisis but they can be found. We are still in Quintana Roo during the winters. Be well. Kevin