yes I don't think the Dickinson is at fault here. It's mostly the really high percentage of humidity combined with the fact the camper is made of Aluminium.The combustion of the Dickinson is completely contained within the unit so it only produces dry heat circulated via the built-in fan. Intake and exhaust are routed externally of the camper. So a little different than most used propane heaters in the overland and RV world that produce a lot of moisture.
Also my truck is parked outside in the element and we often have several days of pretty sever rain.
I am happy with my set up and the little amount of condensation hasn't been a huge hassle for me