2 chargers are not going to draw more than 10a, the smart tray draws sod all, as will a car stand fan.
i share one with a friend and we've used ours for a few years. If you overload it then it probably will struggle, but we've ran two chargers and smart trays on ours in the past (no longer with lipo!) and it's been fine.
As stated before, if you want something uber reliable then pay the money. But i certainly wouldn't pay the £90 for a much more one, they are no better.
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