My husband and I just bought a trailer. We are trying to figure out how many watts we will need to power it (including the ac). We know the little formula, unfortunately I don't know the numbers to plug in. In other words, I don't know what watts each individual item use. I don't mind erring on the side of a little too much power, but at the same time I don't want to spend more than we need to. Also, is there any generators as quiet as the Honda ones.