Perhaps a crate in the back seat with tasty/high value treats and favorite toy and yes to on the way to a place they like.
A cozy confined area may help.
There's classes for training/helping older dogs/not puppies so it's likely it can be done.
If your dog is comfortable in a crate at home and one will fit in your vehicle, try putting the dog in a crate as madguy30 says. Often makes them feel safe.
Does not sound like your dog gets car sick, but still might be OK to give a ginger snap before traveling. Ginger is supposed to soothe an upset stomach.