A ~50ft trailer is pretty common, and it should be about 8ft wide and 8ft tall. So 24ft * 50ft is more than 1000sqft and it's approx 10sqft to the sqm.

Of course your best case scenario is only about 400sqft illuminated. Insolation tops out at 100w/sqft and the max efficiency of commercial panels is maybe 22-24%. Doing the math there you get something like 7-10kw which is nowhere near enough to push one of these down the highway.

A normal semi gets maybe 6-8mpg on diesel which means burning 8gal to go 60mi in 1hr. You get about 10hp/gal/hr out of a diesel so that means it takes something like 80hp or 60kw to drive a truck down the road.

It's more then enough to run the climate control, lights, and other cab loads and slow battery drain just a bit. But you'd have to leave the truck to charge for a week in order to drive for a day.