Take the train down by yourself, wait and see how many large gifts you get, and then re-evaluate. People who realize you will have trouble transporting things will hopefully ship them to your home.
If you do find you have too much stuff to ship, your husband could take the train down to meet you, and then rent a car/truck in the correct size and drive back with you. If you don't need him, you can come back on the train. This way, you're not out the expense of a car rental unless you actually need it, and you don't accidentally rent something that still isn't big enough for what you have, although it does mean your husband would have to be willing to "standby".