I have a really solid aluminum hand truck with stair skids on it. Most appliances weigh less than 250 lbs (I would guess average would be 175-200 lbs) and I'm able to move even the heavier ones up and down stairs by myself (not always easy!) It can be pretty physically demanding work sometimes, and I will ask questions to find out how difficult it might be to remove/deliver an appliance and bring help if I need it.
I'm thinking he gets a little bit of free labor out of his kids :)
Not yet :) They are all years old and younger. When they are teenagers though...