Hi,
Unlike some we put some items on the bed ( which has a waterproof cover on it) then the canvas folds up on top. We store nothing on the top cover. The reason this is, if you arrive somewhere and it's raining, you don't want to have to unload tables, chairs and what ever in the rain to set up. With our set up we just need to take the top cover off and the tent unfolds, with us able to get straight inside and set up the two internal poles, we are out of the weather and so is the items we load on the bed, out of the rain and basic setup 5 mins.
Anyway just our thoughts