I've sold a lot of contracts residentially over the years with almost zero problems.
A little tougher to do now because all you guys went to the nickel dime method.
I used to send them out in Feb with a down payment required that equaled the clean up and mulch work plus a few bucks. Then equal monthly payments billed March 1 thru Nov 1, terms due 30th of the month.
For me that meant cleanups and mulch were covered early and the March payment due by the 30th gave me $$$ to start cutting.
Properly written contracts are a must.