This weekend, Audi marked the competition debut of its latest R18 race cars at the second round of the World Endurance Championship at Spa-Francorchamps. Yet the most spectacular race car running on any track this weekend was thousands of miles away at the New Hampshire Motor Speedway in the 24 Hours of Lemons "Loudon Annoying" event taking place at the very same time.

Yes, that's a pop-up camper trailer that's been converted into a race car by SpeedyCop & the Gang of Outlaws. And there's video of it after the jump. Now, before you click, see if you can guess what the car underneath is. (Hint, there's another photo in the gallery that makes it very clear.) That answer is also posted after the break, and it makes the whole rig even more fantastic.

Thanks to our friend (and Consumer Reports hotshoe) Jake Fisher for the on-site photos!

Update: Final race recap now posted at Car and Driver.

And the car underneath it all? None other than a Suzuki X-90.