Here's an interesting solution for car campers: This accessories collection by SeaSucker, which allows you to set up a portable kitchen using your vehicle as the structure.

Vacuum mounts, which you pump the vacuum into manually, adhere to your vehicle to support a worksurface, a sink, a garbage bag, a paper towel holder, a flashlight, cups, and even a pressurized water tank.

The company says their mounts will retain vacuum for 24 hours. When they start to lose pressure, you'll know it; the piston-like cylinder that you use to pump in pressure has an orange marking on it at a specific depth. If the cylinder starts to protrude and you see orange, you'll know you need to pump it up again.

The pressurized water tank, and the design of its operation, are particularly impressive:

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If you're wondering about the company's name, they got their start making vacuum mounts for marine applications.