Storage when on pitch

Umh!, swap it for a caravan

But a caravan is bigger than a pup tent

I have seen people using the plastic garden storage boxes that double as a seat which you can buy flat-pack from B&Q (others available) and clip together.

While they are ideal I wondered for a while how they were transported until I saw a chap dismantling his before departure! With a motor caravan there are platforms that can be attached to the rear that could save the need for that.

Thanks Nav, we already have a platform for my wife's mobility scooter, but if they clip together that might be worth looking at ,depends on the size

We just leave our stuff neatly on pitch, but not valuable items of course. Everything waterproof as well. If CL is quite secure, or folks around, we don't worry. Two items in 35 years disappeared, one a home made pitch marker, other a plastic water carrier, but they left us the cap! We don't always take hook up cable if we are returning to same site. Just unplug, (both ends of course) coil up and leave with other things. 

We did think of a pup tent when we used van without awning, but decided that it proved more likely to be "investigated". Depends on site of course, wouldn't leave anything out even overnight at Clumber! Not the members you worry about, but the surrounding visitors, looking for easy pickings!

We do have a Fiamma box for use on bike rack when we aren't carrying bikes.

We do not leave anything if we do go out in the van except the EHU cable and the pitch in use sign.  We just pack stuff back into the garage.  Have seen some MH's with stand alone awnings they re-attach when coming back for the day, others just leave it piled up on the pitch.  I guess you could just put a tarpaulin over them to stop any rain, or is it the security side you are worried about?

I leave nothing but a "motorhome using this pitch" sign if I venture out in the van. If I leave the chairs behind I won't have anything to sit on when I park up somewhere, eg by the beach.
However, when I have been running a rally or THS I have needed somewhere to store the parphenalia involved and for this I used one of those self erecting 2 man tents. Just take it out the bag and throw it on the ground and whush you have a tent. Cheap too and easily stored as it folds flat, once you have mastered how to get it back in the bag! Got mine from Go Outdoors about £25.

We just leave the sign out , our chairs fold up into bags and we only have the stored van table (hardly ever use it thanks to a small swing out table permanently in use.) We've cut down on all the things we used to take in our caravan. 

Have used a pop up tent....getting it back into the bag was a challenge as per Peegeenine's post.  

We only Ieave the pitch marker and EHU cable. Everything else goes with us stored in its dedicated place.