Having read a couple of books on the story of Tucker, both Preston Tucker, and the car, a few things stand out: For starters (and importantly, I think) Preston Tucker, by 1946, had a considerable reputation as being more than a bit of a huckster. He first seemed to appear on the automotive scene in the early 1930's, and for the 1935 Indianapolis 500 Mile race, recruited the famed, but vastly reduced-in-circumstances, the legendary Harry Armenius Miller, who headed up the company responsible for so many fabulous 122 and 91 cid race cars of the 1920's, to design a new car, front drive, using modified (read that hopped up) Ford V8 engines. He then managed, through Edsel Ford, to convince Henry Ford to bankroll the project--which resulted in a team of 11 Miller-Ford front drive race cars for the 1935 "500". They were a dismal failure, the only cars to make the race all went out with steering gear seizure, due to Miller's insistence that the small, very precisely (read that very tight internal clearances) built steering gears be mounted within an inch or so of the left hand exhaust header--they got so out as to boil the grease out of them, then seized up). That experience soured Ford Motor Company and the Ford family on racing involvement for another 20 years, 29 years in the case of Indianapolis racing. Henry Ford was so incensed that he had his company take possession of the Miller Fords, which got locked away, none of them reappearing until 1941, when the Winfield brothers Bud (carburetion expert) and Ed (camshaft design) managed to pry one loose for mounting their new Winfield Supercharged V8 in--that engine being renamed the Novi in 1946.
During WW-II, Tucker ran a contract machine shop in Ypsilanti MI, built up an armored car with an electric turret carrying a pair of machine guns, for which he made outlandish claims of ground speed, as well as the turret being the best ever designed. The movie hints that the US Military used Tucker's turret in bombers, both USAAF and US Navy, but if one looks up the specifications for any US Military aircraft equipped with any sort of swiveling turret, nowhere does the Tucker turret come to be mentioned.
Following VJ Day, Preston Tucker became one of many who could readily see the huge market that existed for new cars--by then the average age of cars on American roads was an astonishing 15+ years, brought on mostly by the Great Depression (which while formally ending in 1933, had its effects on public confidence economically all the way out to about 1940 (when the US morphed into the "Arsenal of Democracy", then followed by 3 1/2 years of no new automobiles being produced, due to the total war effort.
Trouble was, by 1945, Preston Tucker didn't have the money to start up a new automobile company on his own, and was pretty much "persona non grata" in the financial industry--hence his feverish drive to promote his "ideas" to the general public at large. And frankly, many of his sales pitches were the stuff of fraudsters, shysters, whether or not he was that himself--that's what raised a lot of eyebrows. Instead of starting out relatively small (arguably a questionable venture at any rate), Tucker went way beyond what any other startup in the auto industry had ever done, from a cold beginning (by contrast, Henry Kaiser was a known entity, had an enviable record of successful ventures--from Hoover Dam to the building of hundreds of Liberty Ships and the shipyard they were built in, from scratch) to be a major automaker overnight. It got to the point that he was selling dealerships in Tuckers before the first samples were even assembled--anyone wanting to become a Tucker dealer had to buy a boatload of Tucker accessories ahead of car production, and pay for them in cash (a local acquaintance of mine here inherited a 2 1/2 car garage full of that stuff (anyone want a radio with antenna for a Tucker perhaps?) when his father took a bath on those parts.
With all of this, it took only a second-rate muckraking columnist in New York City, Westbrook Pegler, and a Michigan senator who may or may not have had direct ties with any of the Big Three automakers, to derail the man's ambitions, and while he was absolved of any criminal wrong doing, it is pretty evident that Tucker Motors would not have survived the end of the postwar seller's market anyway--non of the surviving "independent" automakers did, save for American Motors the rest (Studebaker, Packard, Hudson, Kaiser-Frazer, Crosley and a half dozen or so mini car manufacturers were all gone from the US scene by the end of 1963. How could Tucker have survived in the long run, as thinly capitalized as it was when for example, GM spent almost 10 times Tucker's capitalization just to restyle their 1949 car lines?