We don't have heaters, and the only concern I would have would be, how hot do they get, and is it still cool enough to not soften the ABS plastic the waste tanks are made of? I just repaired a crack in the grey tank, and was amazed at the lack of support under the tanks. I added two more braces across the frame under the tanks, and blocked under the tanks so there is support every foot. The tank plastic is not very thick and it does not surprise me that there are a number of us that have had tank failures.
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