What is interesting is that from experience buying vacs from Craigslist and ebay sellers is that USPS tends to charge less than either UPS or FedEx Ground. FedEx ground is cheapest up to 20 lbs. After that their rates soar so much that shipping a typical full sized canister with powered floor brush costs around $75 to ship, which is a deal breaker. UPS isn't a whole lot cheaper but USPS is around $40-$45 depending on the weight. Still a bit stiff but if the vac itself is cheap and it's something you really want, well ............................
Not sure that old De Soto is up to the trip, and I speak from experience with Chryslers of that era. Decaying cloth insulated electrics (sniff, sniff, oh crap another short), oil bath air cleaners, optional oil filters (our old Plymouth didn't even have an oil filter, my dad added, a big cartridge type), inadequate cooling, single circuit drum brakes (remember what drum brakes were like in the rain, either no brakes or the car would swerve to one side? Oh HELL no!), the defroster is a joke (my "defroster" was an old towel stuffed under the seat to wipe the windows with), AM only tube radios with one big speaker in the middle of the steel dash board, so much body roll in corners the curb feelers would scrape, huge brake dive (more dive than actual braking on some of those old beasts), no air conditioning, no modern safety features so if someone hits your beauty hard you die and ugly death. Nope, been there done that, never again. Late 1980's and later for my cars.