Ranger Designs complete van system for plumber/hvac/electrician/etc. Two fold down shelves, topped by two stationary shelves on the long side. On the short side is a rack with partitions. There is a large partition to separate the cab from the rear of the van. All of these things bolt in to the flooring and the van itself. This fits a 2019 ford transit with LWB.
Everything is still installed in van, ideally I would drive the van to you and remove at your desired location.
Comparable new systems, by Ranger Designs or others range from 5-10k for this same setup.