You might be able to put a hitch hauler in your trailer hitch and add some type of tie down to the top/side of your camper. Another option for an 8 ft boat is lengthwise attached to the bumper of the camper and jacks on the side. I'm assuming you mean a slide in camper.

If you don't already have something to tie to on the top of the camper, you probably will want to check with the manufacturer to make sure you don't pull your camper a part with the pressure.
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Wear a PFD if you want to live.