I don't have any experience with a 40 footer but if it were me knowing what I've learned I'd probably go with a dually 3500 diesel. Brand is a personal choice. I'm a GMC fan
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Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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