Small coolerbox for 3 or 4 days?

Out of interest, where do you mount your 100w panel?
I'm trying to boost my electric capability in my small 20 footer and it seems that a gantry would be the only place to site a decent sized panel and I really don't want a gantry on such a small boat. Looking for ideas. The only place I've come up with is to clip it onto the back rail with clips then supporting it out over the water at the stern. But then it inhibits the access from the stern from dinghy or swimming activities.
I have 90 Watts of solar on an 18footer.. panels each side of the pushpit and one over the stern, all can be folded flat or easily removed if required.
 
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