I've never commuted with a trailer, but i certainly would. I also have heavy luggage like you; long days, heavy lunch, all weather gear, work clothes, grocery stops. I've made do with my panniers, but taco'ed a rear wheel with the load and had to buy a custom (expensive!) heavy duty rear wheel. The good news is that custom built rear wheel can now carry a 60 lb bag of dog food. The panniers, on the other hand, need to be replaced often enough that i could have purchased 2 or 3 trailers by now.

One of my old neighbors took his kids to school in a trailer on his way to work. He made an agreement with the school to leave his trailer there so he could ride into work unemcombered. It was a good arrangement for him, but they really loved him on the days of heavy rain when he dropped off two soaking wet kids and a trailer full of road sludge.