I do not have a trailer. The plane and the gas can are transported inside the SUV.
I don't either, my plane and gas can are hauled in my Toyota Sienna. I have never noticed much if any odor in the vehicle. I asked the question months ago when I decided to build a gasser about hauling gas planes inside a vehicle and the opinion was it's no big deal. That's been my experience so far. I even considered using camp fuel for that very reason but I realize now it's completely unnecessary
The key is I think is making sure there aren't any gas drips inside the vehicle. I take care to no spill any gas down the side of the can or on the plane. Even a few drops of gas will make it smell strong inside the car. I even left my plane and gas can in my vehicle overnight because I planned to go out first thing in the morning and barely noticed anything.
Mike