QUOTE: “ Husband is concerned about aerodynamics. It wouldn't explode on us going down the highway at 60 mph, would it? “ JMHO, that’s a lot to ask for , maybe a more traditional design trailer (aerodynamic) , a mushroom house with a Hobbit door ? ... Painted to resemble something period ( mud and straw ) ... People build Vardos with flatish fronts , and do report drag ... But they are usually well constructed to withstand it ...
And we’re not even going to mention crosswinds ...
If you really want to pull something lke that , go real enactor and get a horse ... Or make a streamline Foam front end cap that could be detached for “show” ... Drag increases exponentially with speed .... you could drive slower ... Nothing is impossible , but you may have to compromise a bit ... stronger build ? sleeker design ? Slow down ....