I have lost a cart in storms, but after that I found the best way to store carts is at the rudder end, I pointed them into the stern and they were pretty rock solid after that I can't remember if ended up with 3or 2 carts in that configuration.

I would find an already made hut, tower, cave entrance etc. Troll cave was the best in free shelter set up, you can fit everything in the troll entrance all sheltered. When I was done exploring that island and using the resources I'd pack up and move on just like a "wandering caravan person" . Wow can't believe the g word is censored lol