This should be a one-time thing. Usually if I'm going to have the camper hooked up (pop-up) and need to haul a bike, I just take the cap off. This time it's going to be longer than just the weekend and I'll need the cap to keep my crap secure.
It was surprisingly easy - everything worked out just right. The bike is so light that just sliding it in with the forks was a piece of cake. There's gonna be so much crap packed in around it that the tie downs will probably be unnecessary anyway.