Watch out for water intrusion on Big Horn and Landmark roofs. They are TPO/EPDM on laminate with 1/8inch Luan and foam. They are OK to walk on, and That makes them super intolerant to water intrusion as compared to TPO/EPDM on marine grade ply wood. Also, if you plan on solar panels mounted on the roof, there is not much material to mount the panels properly. Any water intrusion will cause bubbling and soft spots of the roof and could be expensive to repair if at all. It is a mystery why Heartland chose to luan instead of Adzel if they were laminating the roofs.
The newer unints may not be laminatied but prior to 2016 they were.