Jimmy Fallon, new host of "The Tonight Show," knows what he wants to spend one of his first paychecks on -- a truck. And automakers are tripping over themselves to get him behind the wheel of one of their pickups.

The problem is that Fallon doesn't know trucks that well.

On Wednesday night he asked his stage band, The Roots, if any of its members drove a truck and if they could help him out. But none did, so Fallon asked his audience about trucks.

One man yelled that he drove a Ford F-150. To which Fallon asked how big the truck was. The response he got became a running joke for the rest of the show: "Big enough."

It took only minutes for Ford to jump on the offhand remark. The company took to Twitter to suggest a 2015 F-150 King Ranch, a truck that is not yet available to the public and might not be available for months.

Chevrolet waded into the waters early Thursday morning, telling the late-night host that a "Silverado would look nice" in his driveway.

Chrysler Group's Ram brand went all in and created #GUTSGLORYFallon on Twitter, a medium that Fallon has used successfully on "Late Night" and now on "The Tonight Show," and sent him messages throughout Thursday.

The brand even pulled up outside 30 Rockefeller Center in New York, where "The Tonight Show" is taped, in a silver Hemi-powered 2014 Ram 1500 crew cab with a sign on the back that read, "Big enough, Jimmy? Test it out."

Automotive News has more on the story.