I think you can pull it off.
So you have 90+ hours of work to do half the trailer (one side and one end). You'll need 11-12 bikini clad ladies and an equal amount of Polishers. That should get you done in one day, about 8 hours. You can get a polisher at Harbor Freight for $30-40 ea. plus the wool pads and polish you'll be into $800 in equipment and materials. The final "mirror" polish should probably be done off camera? And the final inspection will be awesome with all the ladies around.
I'm going to assume you're serious about this, and want them to do the work and not some stand-in professionals. If that's the case, you're going to need them to put on overalls, hats, gloves, goggles, etc. and get to work. This would need to be part of the introduction, and I'm sure could be done in a very sexy way. I'm imagining a couple sweaty lemonade breaks, and little tell tales that they are actually doing the work, and not stunt doubles under the overalls.
I was looking for an image of this...
And I found this as well. This is what I have in my head:
You obviously don't screw around. You bought the airstream. You bought a diesel Defender. I have no doubt that you'll pull this off. Of course this is a crazy idea; that's what will get you attention and maybe those 1,000,000 youtube views.
You're going to need 2 or 3 time lapse cameras, and 2-3 cameras filming the process, and trying to get that candid moment that will make the video.
I'm eager to see how it turns out.