Hmm. I have always wondered about the heat build up in the trailer as well but my machines have always been stored in the trailer and I've had no adverse effects. I charge my batteries a couple times over the summer and they have been fine. I suspect the vast majority of machines are stored in trailers. I would think condensation would be the biggest concern with ethanol in the gas. When I get my sleds ready for the season I syphon as much gas as possible out of them and fill them with fresh.
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