Does anyone have a copy of a trial contract that would hold up?

So we decided to sell one of the horses as a hunter since she has been showing us that she is most likely going to be an AO hunter or derby horse she needs to go to a hunter barn, not a jumper and eventing stable. Had a person approach me at the show we were just at and wants to take her on a week trial. They were going to try her at the show, but it got so insane and hot that the timing didn’t work out. So needless to say I need a good contract. I don’t usually let horses go on trial, but I really need her sold as I can’t ride, and she is jumping all my students out of their tack.