I know a couple who rented two moving trucks when they moved--one for their belongings and a second one completely devoted to the plants from their garden. It was quite an undertaking! All of the plants you want to take from your garden will have to be dug and potted, and all of those pots will take up space in your truck. Load the plants in last so that they can be unloaded first upon your arrival. Set them in a shady spot and water thoroughly. Because you have to leave them unattended for some time, you'll need to plant them in the ground and soak them in. If you have a site prepared ahead of time, your planting job will be much easier. You might want to rototill a large spot and just line them up in rows. (They can be moved to permanent locations in the fall.) Newly transplanted plants do need TLC, so it'd be a good idea to befriend a new neighbor or hire a kid in your new neighborhood to water deeply once a week. You might use a water sprinkler on a timer and just ask a neighbor to check on it every few days to make sure the hose hasn't burst or something.