My
2015 Heartland - North Trail 23RBS has one roof vent in the bathroom and not a lot of windows. I want to add at least two more powered roof vents. One in main living area and one in the bedroom. The optimal place in bedroom would be center next to divider wall. There is a light there now but I can relocate that. The living room has hanging light over since Island so I will need to offset roof vent from center. Question is how do I know where roof structure is? I don’t want to drill a bunch of holes looking for them. Any ideas?