My 1997 Starcraft Meteorite 817 has a roof vent and has a the a blank outlet marked Air Condioning for the electrical. My question is do I need to add roof support? There appers to be one brace going across the roof about mid box. If someone is familiar with this model I would appreciate any advice. What are peoples thoughts on doing this myself. I have found a used a/c unit for $200. Thought that was a pretty good deal. Thanks.