All they're getting from me is the number of people living in the house. If they get nasty I'll whip out the Constitution and read to them. If they stay nasty I'll read Vogon poetry at them.
All they need for this job is a clipboard and some sheets of paper listing the houses they need to get headcounts from. They'll need a pencil too. So maybe $10 worth of hardware for each jackbooted census worker. Low tech.
This is gonna be fun! I hope they show up at l'heure verte so that I'll be properly prepared.