I have a push bar on my Ranger for a reason...to push cars.
Mostly old cars but not antiques. (80s & 90s).
Have done so many times without damage, even on styrofoam bumpers with rubber covers.
This activity often requires a little instruction for the driver being pushed in order to do so safely over any distance.
IllAnnoy has recently made it illegal to push a vehicle further than required to get out of immediate harms way. This may affect how far I will push one in the future. Still gotta get'em inside the shop or onto an occasional trailer though.
It is still legal to tow with a chain however. Another activity where some skill is required for both drivers.