Some items for car camping travel

I recently bought some items for my next car camping adventure.  I'll include images and links that have reviews of the items.
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I hope to strap this five-gallon shower to the luggage rack on top of my car so it can heat up during the day, then use it for showering when I stop in a secluded location.

Here is where to buy this Summer Shower.

I also bought a large vertical tent-like apparition to take showers in (it's sorta shaped like a port-a-potty, only tapered at the top and not quite as big).  But I might not bring that with me on my next trip.  I'm thinking the hassle factor of setting it up to take a shower might not make it worth it, though it would shelter me from the elements.  I can probably just take showers wearing shorts if I'm in a public place.
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Here is a rice cooker/crock pot that operates off of the car's cigarette lighter outlet:

Here's where to buy this Car Crock Pot.
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Speaking of the cigarette outlet, here is a device that converts from a cigarette lighter's output to USB:

Here's where to buy this Car USB Port.
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I'll report on how well these devices work as I use them.