My grandmother used to have these little wheeled platforms that her planters set upon. I wonder if those would help you, Critter. I haven't grown any trees that have to be moved inside, because I didn't have a good place to keep them. If your door is 30" wide, you can use a large pot, at least ten gallons (though I haven't done the math), which I'd imagine could hold a dwarf fruit tree.
For the broccoli question, I think the answer is different for Critter and Arlene. In zone 8, a late summer or early fall planting will give a winter harvest, and if you have a variety that produces side-shoots, you can keep harvesting until spring. In zone 5, I don't think the plants will stand all winter, so your best bet would be to start the seeds inside in winter and plant them out in early spring and harvest in late spring. Broccoli needs a bit of warmth to germinate, but once the plants are established, they can take quite a bit of frost. You want them to get to harvestable size before the weather starts to get hot - highs around 80 made my Brassicas go bitter, so aim for harvesting before that.
