Fred Keller and Judy Foster know the first question.
It's the same thing people always ask, whenever the couple is out for a spin in their 13-foot replica of a Radio Flyer wagon.
How fast does it go?
"As fast as you're willing to push us," says Foster, with a grin.
That's a joke, of course.
Although their car ... or whatever it is ... looks like a giant Radio Flyer, it has a 4-cylinder engine, goes up to 60 mph and gets 23 miles to the gallon.
Its road-legal, too, though you have to wonder how that conversation went with their insurance agent.
The couple of 17 years hauled their contraption to Charlotte from their home in Wasilla, Alaska, for this week's Food Lion AutoFair at Charlotte Motor Speedway.
This will be their national show car circuit debut, and proud they are.
They're essentially driving her late father's '76 Mazda pickup, which Keller transformed in 2009 using marine plywood, fiberglass cloth and foam core.
It took 11 months, and the result is almost four times the size of a regular Radio Flyer wagon.
"We were at a car show in Portland (Ore.) and I saw a similar version that was beautiful, but slick, like a hot rod," says Keller.
"I felt it should be more authentic ... and we had that Mazda sitting behind the house that she refused to get rid of, so I said: 'Why don't we build a Radio Flyer?'"
Foster continues: "I was hesitant, but thought it over and agreed it was a good use for my dad's pickup. He'd have gotten a big laugh out of it."
The organizers at AutoFair have certainly gotten a kick out of it, claiming the wagon needs to be seen to be believed.
And this is coming from people who've put on shows featuring a hydro car that went from water to land, and street-legal bumper cars made from an old carnival ride.
"My first reaction was: 'I don't believe somebody took the time to do this, and in such detail,'" says Megan Hazel, the event supervisor. "We're always looking for something unique, something you can't see just anywhere, and this was right up our alley."
The steering wheel, Foster's idea, is made of a 13-inch toy wagon wheel, and the axle caps are necks from detergent bottles filled with epoxy.
As for the 81/2-foot wagon handle in front, it does come down, just in case somebody is brave enough to try and pull it.
The couple does drive it on streets, though they're not sure they're brave enough to tackle Charlotte's traffic. It's a little stiff, like a sports car, they say "and a little breezy."
Coincidentally, this is not the first big job Keller, a retiree, has undertaken. He built the couple's home in Alaska, as well as five airplanes. Both Keller and Foster are licensed pilots.
The cost of the project is tough to pin down, since they already had the truck, and a lot of the material was lying around in the garage.
"I would turn down $100,000 for it, because of the sentimental value," she says. "It's still my dad's pickup."
Only now it's a convertible, with a really long handle.