The bike rack with the highest weight capacity and rated for a Camper like your 2019 Coachmen Clipper Classic Camper is the Swagman E-Spec Bike Rack for 2 Electric Bikes # S94FR which can accommodate two bikes weighing up to 70lbs each.
Your best bet is to remove the batteries and any accessories and see if you can get the bikes down to 70lbs each.
I included a video of the Swagman # S94FR for you to take a look at. view full answer...
The best way to install the MaxxFan Deluxe Roof Vent w/ 12V Fan and Thermostat # MA00-05100K that you referenced is to use the included screws and sealant to attach it to your pop up. Sealant alone would not be enough and we don't have a clamp on kit. For sealant then you'd want the part # 0160297. view full answer...