Is there an adapter that allows you to hitch a trailer to your vehicle without a permanent vehicle mount?

Other answer:

Smileyface:
I remember years ago that U-haul provided them with trailers so you could tow their trailer with your Oldsmobile. They attached with chains tightened around the bumper. As others say, back when bumpers were non-crumple metal. Our 1970's Olds was designed so that the jack actually fitted under the bumper to lift the car, which as I had just arrived from the UK I found totally weird (along with the foot-activated handbrake and the gas filler pipe hidden under the rear numberplate).

Some pickup trucks still have strong bumpers, and you can get a towball that bolts right on to the step in the middle. Canada (at least) requires that there also be somewhere to attach safety chains.

rick29148:
Back in the day when cars had real steel bumpers, there were, but now that bumpers are plastic, not a chance. They have to go up under the back end to find something structural to hold on to.
Dimo J:
All commercial trailer hitches are bolted on, hence can be removed.
oklatom:
Yes, but not safely. When bumpers were actually metal you could get one that bolted on, but they tended to loosen up on you. Today with plastic ones…well…
ㅤ:
A thought shared.
STEPHEN:
Only if you have the adaptor permanently fitted to your car.
Mordecai:
y