yep .. damp rid, store it closed with the nose tilted up a bit ... so no moisture/rain builds up on the mid-roof seal, just above the window. Pull the covers off both your propane tank and spare tire ... store inside once they are dry, and cover both the spare and tanks with a bungied tarp, this helps the covers look and stay new for a few more years. Disconnect the battery and store it inside, and run a charger on it once in a while to help it along through the long winter months. Check your tire pressure and push in a few lbs of air if needed.
cheers.... and welcome to the forum
2008 Nissan Frontier 4x4
2011 Rockwood A122