Yes, you can leave a small overnight bag with the van for your hike, for your pre and post trip stuff. Please don’t bring a suitcase and a whole bunch of stuff. A small pack or bag is fine.
If you have a bunch of pre-trip or post-trip stuff, see if you can leave it with your hotel in Anchorage and pick it up on your return. Most hotels in Anchorage are fine with this and do it regularly.
