Camper for the Trip

So, the plan is to get a camper for the trip. Not one of those tow behind camper trailers, but rather a camper that sits on top of the truck bed. There are many options here, all of which are very expensive. So thanks to a conversation with a friend the other morning, I am now looking into options to rent a camper. Really what I need is the camper for the truck for one or two weekends in the spring for a test run, then for 3 weeks at the end of the summer for the actual adventure. Time to start looking for a way to rent the camper.