Change motor oil, replace spark plugs, plug wires, distributer cap, air filter and fuel filter. Replacing these items will allow you to get on a maintenance schedule and hopefully stay out of the shop during an adventure. This is also a good way to get familiar with your van.
Roof racks are a great way to expand the carrying capacity of your rig. You must remember, while the fiberglass roof can handle weight, it was not intended to have a rack on it. If you are carrying anything and plan to use your pop top, you must install a lift-assist kit.