Determine the features and capacities of your camper shell. Features such as electrical hookups, cooking facilities, toilet facilities and heating/cooling should be taken into consideration. A good understanding of your camper shell will help you plan your trip and what you'll need to look for in a camping site.
With a destination in mind, configure your camper shell for the trip. Depending on the location and expected weather, items such as additional bedding and blankets, external gas hookups for cooking and heating, liquid propane gas tanks, electrical extension cords and refrigeration should be considered. With the thought that you won't be able to purchase it at the camp site, plan for any technical or mechanical item that you could possibly need. This will eliminate searching for some missing part in an unfamiliar area.
Pack for the trip with as few items as necessary and consider purchasing consumables such as food or ice at your destination. Carrying excess items will only crowd your camper shell, increase the load on your truck and reduce gas mileage.
At your destination, take time to set up your camper shell for your visit. Be sure to use the camper shell jacks to stabilize the camper while in use. External electrical or gas lines should be routed so they don't present a hazard to anyone walking around the camper. Always lock your truck and camper shell if you leave the campground, and secure any external items such as generators, propane tanks or sports gear.