The Aliner is not going to have a lot of room when closed and that space is probably better used for camping stuff (chairs, etc.). A rack on the Aliner roof is a good solution for carrying while traveling and would allow you to choose the bike that best meets your anticipated riding instead of the one that fits into a tiny space.

Now let me take off my BF hat and put on my RV forum moderator hat. If you are so near max capacity that you are concerned about tongue weight, you probably should be rethinking your tow vehicle. Pushing a tow vehicle to the max is not fun and will not only lead to more stressful travel but will shorten the life of your tow vehicle. OK, moderator hat off.