With respect to freeing stuck brakes, I rode in a LR Discovery shell with seized wheels. We took the pads out and it still wouldn't budge so we towed it down the road to try to free the hubs with me straddling the transmission brake. Three went fairly quickly and rolled, but we went a good 50 metres before the last wheel found a drain cover and finally gripped hard enough to break loose.
In other words, it can take serious effort to free up a wheel, as you are limited by tyre grip. If the tow-truck dragging it onto the trailer didn't do it, then disassembly seems a necessary step.