Without wishing to pry too much, what is your disability?
If its to do with walking then youre probably correct, delivering parcels to blocks of flats aint gonna be much good! Distance van work can be time critical and sitting in the seat for hours on end wont do anyone`s back any favours.
As suggested trunking can be OK. Not zero effort but “doable”.
Maybe containers are the least physically demanding common job? There are others of course, but maybe that is the most likely?