A few months ago, I posted an idea about putting generation 3 PV flexible panels on standard shipping containers. They way they are built to interlock on board ship creates an offset so that an encapsulated PV set can be affixed to the steel panels on all sides except the bottoms. No crushing and minimal scraping or dirt would get on them. They don't get walked upon, either. They already have wiring harnesses for various purposes, such as daisy chaining for powering reefer cars and for transport position logging and car content ID manifest purposes.
When in transit, the electricity they generate can offset fuel use on ships and trains and tractor trailer trucks/lorries. When they are stacked dockside and in intermodal freight facitilities, they would be providing more power by using the wiring harnesses to grid tie them. Also, there are millions of acres worth of unshaded railroad right-of-ways and highway right-of-ways that could have solar PV and also small ground level VAWT wind turbines - lots of breeze created by vehicles passing. The cumulative effect of utilizing all this available, unutilized industrial and transportation space would be staggering. Since installing these systems would both save and make some money for the transportation sector, and most of what I mentioned as installation objects and places are privately owned by the shipping companies, I can't see why it wouldn't take off quickly.