I use my car trunk when tent camping. I can fit a cot, camp chair, folding stool, tent, wood stove, firestarter and treated wood chips, a vintage suitcase that is weather resistant for clothes & meds, and a small cooler for food and water. My ukulele rides in the passenger seat. I have done it so often that it is easy to pack.
The travel trailer is small. I leave kitchen items in it such as pots and pans, and external items such water & sewer hoses stay in storage bins. Everything else comes out and goes into an outbuilding, or into the house such as clothes, towels, and food. The trailer gets cleaned, and then repacked the day before the next trip. I have found it is easier to prep when empty. It is harder to stow items in it between trips, and then have to work around stuff when trying to get ready.