How about this for storage/shelving?

https://levrack.com/Looked neat till I came across the price. I have the skid racking, got it from the scrap yard for whatever they were paying for iron at the time. Unistrut and trolley assemblies could make up the rolling part. Attaching it to some type of shelving unit might be the trick. AND how much weight that it could hold. I'll sleep on it a few nights and if I ever see the corner of the garage with the rack, I'll look into it then. Maybe somebody else could use this set-up in the mean time.