Most of the big rigs got worn out and scrapped many years ago. About the only option would be to search out-of-the-way salvage yards where you might be able to acquire a body/frame assembly that's had the running gear scavenged out of it.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!