I just bought my first Belgian yesterday. A 12yr old Amish broke mare, she's been broke to ride/drive. I have some experience with Belgians as my Uncle has 12 and uses them in competitions all over the country. My question is I'm just starting to get into pulling. I'd like to be able to give her a job to do around the farm to keep her busy and I think being able to hitch her up to a sled, or logs to exercise her and keep her skills up would be great. I purchased a harness for her yesterday as well and I will have to get her a new collar. She's been using a 28"-30" adjustable collar. The Harness I bought has a 26" collar. Not a big deal I can get her another collar. What I am curious about is a Single tree. What Width should I get her, will a 32" be enough or should I go bigger/smaller. I've been trying to get ahold of my uncle but He hasn't called me back yet. Any advice would be great.