a bike with a trailer replacing a car, stupid idea, it will never catch on ;)
A touring rack will also take pannier baskets, These are the ones I like; they're so large, I rarely have need of more than one on the bike.
http://www.basil.nl/gb/assortment/
(https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fecx.images-amazon.com%2Fimages%2FI%2F61GqX7cWlBL._SL160_.jpg&f=1)