Hi Deb,
The wasp in your photos is a European paper wasp (Polistes diminula).

Unfortunately, I don't have a sure-fire way to prevent those wasps from coming back to nest in/on your vehicle. Anyway you can block the place they enter to build nests so they can't access the part of your vehicle they seem to like?

Here is some info on control of European paper wasps from a Colorado State University Extension webpage so you can see what they suggest....

Individual nests can be destroyed. Insecticides are often used for this purpose and a wide variety of “wasp and hornet” marketed products are effective. If nests are treated, it is recommended to apply treatments in the evening. At this time most of the wasps have returned to the nest so that they can be killed and, after dark, flying activities are greatly reduced.

After the nest has been killed it should be removed and destroyed. This will eliminate larvae that were within capped cells during spraying. These usually survive and later will emerge. It is also recommended that after a nest is removed the area also be washed with a jet of water to eliminate colony odors. These practices will inhibit surviving wasps, not present on the nest when it was destroyed, from attempting to reestablish a nest upon return.

There are no traps or lures that can be used to control this species. Commercially available ‘wasp traps’ are designed to attract certain kinds of yellowjackets and contain baits such as fruit juices, fresh meat, or heptyl butyrate (found in many retail wasp lures). None of these are attractive to the European paper wasp. There has not been any type of trap identified as effective for this species.

I hope those wasps give up on nesting in your vehicle soon!