Henry, thomas, harding and firestone were the self proclaimed “The Vagabonds”.
They regularly took a summer road trip or "gypsy" trips as they referred to them, camping at various spots through our great country. Edison said it was to get out to natures think tank and stimulate ideas, discuss current events, politics, etc....
Others were member too, such as but limited to Thomas Burroughs, Calvin Coolidge, and luther Burbank.
When Harding died and the press started getting wind and following the trips and more importantly when the wives wanted to start being included the trips ended.
There is a story behind these trips, true or not I have no idea. Out in the country and driving through the rain in an old Model T, a farmer noticed five men standing by a Lincoln touring car which was stuck in the mud. He stopped and assisted in pulling the car out of the muck, at which point one of the men stepped forward to shake his hand, telling the farmer, “I made the car you’re driving.” “And I’m the man who made those tires,” added another in the group. He then pointed to two of the others, saying, “Meet the man who invented the electric light — and the President of the United States.” When the fifth man asked the farmer, “I guess you don’t know me either?” the farmer replied, “No, but if you’re the same kind of liar as these other darn fools, I wouldn’t be surprised if you said you was Santa Claus.”