I'm getting a base RT--it seems all the covers I can find are for the RTL with the storage on the back. Has anyone used either the half or full RTL covers on the RT? Will the half cover stay on without the rear storage container? When parking outdoors (my office doesn't have covered parking), is the half cover enough coverage, or is the full cover better? Finally, will the full cover trap moisture and cause any rust or other problems? I've looked for answers here or in product reviews, but the RT is obviously way less popular than the RTL so I can't find them. Thanks.