I would want to know:
How long the work had been established
How it is cleaned
how often
do they have a record to back up the claims they make
if you didnt have any money as a back up plan I would ask why this is, because a pump can and will break as could a load of equipment.
what is the price of the work per month and how much do they want for it, if you cannot afford to pay a loan and have money extra on top of this then to me the deal is not a good one, I dont know what the work is so just gussing. 20,000 leaflets is not alot, I have already done over 10,000 this year another 5,000 are going out in the next month, they do get work in but it is in no way guarenteed mate, I am not trying to put you off, more tying to help.
do you know the figures ?