New from Car Talk R&D: How do you keep a mattress from flying off the roof of your car? The mattress spoiler! We check in with our test pilot, Howard, after his trek to Hunga-Dunga. Plus, how hot is Barney the Big Purple Sexmobile? Steve’s smokin’ Town and Country van needs a cold shower just to get out of the driveway. Also, we track down a serial tire killer: Henry has single-handedly used up all the tire warranties for the rest of us. That, and Vinny the Nose gives his eulogy for the Lincoln Town Car’s luxury-size trunk, and more in this week’s show.