Newbie trying his best

I've been accumulating the recommended kit but despite best efforts cannot find how to stow in the van. Endless repeats of the regs and best practice but all generalisations. How do I stow the empty water roll, the awning, wastehog etc. Yes I know the theory ref balance, nose weight etc but where and how can I stop things rolling around the van when towing. Pegasus 462 with loads of storage space but as far as I can see, I carry everything in the car and transfer it to the van once on site. Apologies if repeat. Nervous first timer. Thanks.