Maybe you already thought about this, but it's always good advice for anyone who decides to store away:
The first worst enemy anyone should worry about when storing is the dead load or even live load the container could receive, particularly when you stack one bin on top of eachother. My best advice to avoid damage resulting from bin stacking is not to fill up your bin all the way to the top, because the lid can deform under the weight of another bin or box sitting on it. I make sure nothing touches the underside of the cover when I close it. I recommend leaving 1 inch iminimum clearance. I know a friend who took just as much care to bubblewrap everything and he filled up his bins to the max. He got bad surprises once he moved into his new place. Many parts gave way under too much pressure.
Bubble wrap may protect your vehicles from getting surface contact. All my vehicles are stored in bin bags and that has done the job to this day. For vehicles that have a clear canopy, I use bubblewrap only around the cockpit.
I've never heard of yellowing due to yellowing...but your concerns seem to be genuine since acidity from certain plastics are linked to causing plastic yellowing.
