My area is different from OTG boston's. there are 2 companies here doing tree care that have a chipper, (me and the other guy) the rest are pickup truck landscapers cutting wood and utility crews doing weekend buzz work.
If it were me, I'd throw some flyers/cards at the local rental shops for the DIY'ers and hit the parking lot of the local utility crews.
I despise cleaning up someone else's mess personally, and have stopped doing that myself, but the work is out there. If I were to start doing that, I'd make it very clear to the weekenders that the brush will be stacked straight and accessable and no wood/logs in it. add a clause in your contract to cover that and foreign (metal) debris.
It brings up the question (in this area anyway) of how much can a guy actually make? usually people wanting to DIY and those hiring weekend buzzers are not the customers whom are willing to pay much for work done. your machine size and dumper capacity will have a huge impact upon how much you make based on how long it takes you to chip a certian sized pile/stack and how many dump runs you will have to stop working to make.
is this one of those chipper dump trailer combos we've seen?
I disagree with the stumper idea, the tree company taking down the tree always gets first crack at stumps, and if they can't afford to have them done then....
IMO, you'd have less headache and more money if you just contracted a dozen lawns to mow weekly.
-Ralph