Annette
They take up loads of room! we just pack them in the underseat storage while towing and most stay there or go in the awning when we arrive.
The Bikes are the biggest problem, we try to lock them to the car carrier over night or in the awning locked to the table and a chair so anyone trying to pinch them will have to make a lot of noise.
Toby (our dog) is too friendly to scare anyone off, so he is no help!
Once you have the gas on, fill up the front cubby with the toys that are OK to get wet
Steve